The Definition of Modesty—The Significance of Modesty—Difficulties in the Way of Its Analysis—The Varying Phenomena of Modesty Among Different Peoples and in Different Ages.

Modesty an Agglomeration of Fears—Children in Relation to Modesty—Modesty in Animals—The Attitude of the Medicean Venus—The Sexual Factor of Modesty Based on Sexual periodicity and on the Primitive Phenomena of Courtship—The Necessity of Seclusion in Primitive Sexual Intercourse—The Meaning of Coquetry—The Sexual Charm of Modesty—Modesty as an Expression of Feminine Erotic Impulse—The Fear of Causing Disgust as a Factor of Modesty—The Modesty of Savages in Regard to Eating in the Presence of Others—The Sacro-Pubic Region as a Focus of Disgust—The Idea of Ceremonial Uncleanliness—The Custom of Veiling the Face—Ornaments and Clothing—Modesty Becomes Concentrated in the Garment—The Economic Factor in Modesty—The Contribution of Civilization to Modesty—The Elaboration of Social Ritual.

The Blush the Sanction of Modesty—The Phenomena of Blushing—Influences Which Modify the Aptitude to Blush—Darkness, Concealment of the Face, Etc.

Summary of the Factors of Modesty—The Future of Modesty—Modesty an Essential Element of Love.

The Various Physiological and Psychological Rhythms—Menstruation—The Alleged Influence of the Moon—Frequent Suppression of Menstruation among Primitive Races—Mittelschmerz—Possible Tendency to a Future Intermenstrual Cycle—Menstruation among Animals—Menstruating Monkeys and Apes—What is Menstruation—Its Primary Cause Still Obscure—The Relation of Menstruation to Ovulation—The Occasional Absence of Menstruation in Health—The Relation of Menstruation to "Heat"—The Prohibition of Intercourse during Menstruation—The Predominance of Sexual Excitement at and around the Menstrual Period—Its Absence during the Period Frequently Apparent only.

The Question of a Monthly Sexual Cycle in Men—The Earliest Suggestions of a General Physiological Cycle in Men—Periodicity in Disease—Insanity, Heart Disease, etc.—The Alleged Twenty-three Days' Cycle—The Physiological Periodicity of Seminal Emissions during Sleep—Original Observations—Fortnightly and Weekly Rhythms.

The Annual Sexual Rhythm—In Animals—In Man—Tendency of the Sexual Impulse to become Heightened in Spring and Autumn—The Prevalence of Seasonal Erotic Festivals—The Feast of Fools—The Easter and Midsummer Bonfires—The Seasonal Variations in Birthrate—The Causes of those Variations—The Typical Conception-rate Curve for Europe—The Seasonal Periodicity of Seminal Emissions During Sleep—Original Observations—Spring and Autumn the Chief Periods of Involuntary Sexual Excitement—The Seasonal Periodicity of Rapes—Of Outbreaks among Prisoners—The Seasonal Curves of Insanity and Suicide—The Growth of Children According to Season—The Annual Curve of Bread-consumption in Prisons—Seasonal Periodicity of Scarlet Fever—The Underlying Causes of these Seasonal Phenomena.

Definition of Auto-erotism—Masturbation only Covers a Small Portion of the Auto-erotic Field—The Importance of this Study, especially To-day—Auto-erotic Phenomena in Animals—Among Savage and Barbaric Races—The Japanese rin-no-tama and other Special Instruments for Obtaining Auto-erotic Gratification—Abuse of the Ordinary Implements and Objects of Daily Life—The Frequency of Hair-pin in the Bladder—The Influence of Horse-exercise and Railway Traveling—The Sewing-machine and the Bicycle—Spontaneous Passive Sexual Excitement—Delectatio Morosa—Day-dreaming—Pollutio—Sexual Excitement During Sleep—Erotic Dreams—The Analogy of Nocturnal Enuresis—Differences in the Erotic Dreams of Men and Women—The Auto-erotic Phenomena of Sleep in the Hysterical—Their Frequently Painful Character.

Hysteria and the Question of Its Relation to the Sexual Emotions—The Early Greek Theories of its Nature and Causation—The Gradual Rise of Modern Views—Charcot—The Revolt Against Charcot's Too Absolute Conclusions—Fallacies Involved—Charcot's Attitude the Outcome of his Personal Temperament—Breuer and Freud—Their Views Supplement and Complete Charcot's—At the Same Time they Furnish a Justification for the Earlier Doctrine of Hysteria—But They Must Not be Regarded as Final—The Diffused Hysteroid Condition in Normal Persons—The Physiological Basis of Hysteria—True Pathological Hysteria is Linked on to almost Normal States, especially to Sex-hunger.

The Prevalence of Masturbation—Its Occurrence in Infancy and Childhood—Is it More Frequent in Males or Females?—After Adolescence Apparently more Frequent in Women—Reasons for the Sexual Distribution of Masturbation—The Alleged Evils of Masturbation—Historical Sketch of the Views Held on This Point—The Symptoms and Results of Masturbation—Its Alleged Influence in Causing Eye Disorders—Its Relation to Insanity and Nervous Disorders—The Evil Effects of Masturbation Usually Occur on the Basis of a Congenitally Morbid Nervous System—Neurasthenia Probably the Commonest Accompaniment of Excessive Masturbation—Precocious Masturbation Tends to Produce Aversion to Coitus—Psychic Results of Habitual Masturbation—Masturbation in Men of Genius—Masturbation as a Nervous Sedative—Typical Cases—The Greek Attitude toward Masturbation—Attitude of the Catholic Theologians—The Mohammedan Attitude—The Modern Scientific Attitude—In What Sense is Masturbation Normal?—The Immense Part in Life Played by Transmuted Auto-erotic Phenomena.

Homosexuality Among Animals—Among the Lower Human Races—The Albanians—The Greeks—The Eskimos—The Tribes of the Northwest United States—Homosexuality Among Soldiers in Europe—Indifference Frequently Manifested by European Lower Classes—Sexual Inversion at Rome—Homosexuality in Prisons—Among Men of Exceptional Intellect and Moral Leaders—Muret—Michelangelo—Winkelmann—Homosexuality in English History—Walt Whitman—Verlaine—Burton's Climatic Theory of Homosexuality—The Racial Factor—The Prevalence of Homosexuality Today.

Westphal—Hössli—Casper—Ulrichs—Krafft-Ebing—Moll—Féré—Kiernan—Lydston—Raffalovich—Edward Carpenter—Hirschfeld.

Relatively Undifferentiated State of the Sexual Impulse in Early Life—The Freudian View—Homosexuality in Schools—The Question of Acquired Homosexuality—Latent Inversion—Retarded Inversion—Bisexuality—The Question of the Invert's Truthfulness—Histories.

Prevalence of Sexual Inversion Among Women—Among Women of Ability—Among the Lower Races—Temporary Homosexuality in Schools, etc.—Histories—Physical and Psychic Characteristics of Inverted Women—The Modern Development of Homosexuality Among Women.

Analysis of Histories—Race—Heredity—General Health—First Appearance of Homosexual Impulse—Sexual Precocity and Hyperesthesia—Suggestion and Other Exciting Causes of Inversion—Masturbation—Attitude Toward Women—Erotic Dreams—Methods of Sexual Relationship—Pseudo-sexual Attraction—Physical Sexual Abnormalities—Artistic and Other Aptitudes—Moral Attitude of the Invert.

What is Sexual Inversion?—Causes of Diverging Views—The Theory of Suggestion Unworkable—Importance of the Congenital Element in Inversion—The Freudian Theory—Embryonic Hermaphroditism as a Key to Inversion—Inversion as a Variation or "Sport"—Comparison with Color-blindness, Color-hearing, and Similar Abnormalities—What is an Abnormality?—Not Necessarily a Disease—Relation of Inversion to Degeneration—Exciting Causes of Inversion—Not Operative in the Absence of Predisposition.

The Prevention of Homosexuality—The Influence of the School—Coeducation—The Treatment of Sexual Inversion—Castration—Hypnotism—Associational Therapy—Psycho-analysis—Mental and Physical Hygiene—Marriage—The Children of Inverts—The Attitude of Society—The Horror Aroused by Homosexuality—Justinian—The Code Napoléon—The State of the Law in Europe Today—Germany—England—What Should be our Attitude Toward Homosexuality?

Definition of Instinct—The Sexual Impulse a Factor of the Sexual Instinct—Theory of the Sexual Impulse as an Impulse of Evacuation—The Evidence in Support of this Theory Inadequate—The Sexual Impulse to Some Extent Independent of the Sexual Glands—The Sexual Impulse in Castrated Animals and Men—The Sexual Impulse in Castrated Women, After the Menopause, and in the Congenital Absence of the Sexual Glands—The Internal Secretions—Analogy between the Sexual Relationship and that of the Suckling Mother and her Child—The Theory of the Sexual Impulse as a Reproductive Impulse—This Theory Untenable—Moll's Definition—The Impulse of Detumescence—The Impulse of Contrectation—Modification of this Theory Proposed—Its Relation to Darwin's Sexual Selection—The Essential Element in Darwin's Conception—Summary of the History of the Doctrine of Sexual Selection. Its Psychological Aspect—Sexual Selection a Part of Natural Selection—The Fundamental Importance of Tumescence—Illustrated by the Phenomena of Courtship in Animals and in Man—The Object of Courtship is to Produce Sexual Tumescence—The Primitive Significance of Dancing in Animals and Man—Dancing is a Potent Agent for Producing Tumescence—The Element of Truth in the Comparison of the Sexual Impulse with an Evacuation, Especially of the Bladder—Both Essentially Involve Nervous Explosions—Their Intimate and Sometimes Vicarious Relationships—Analogy between Coitus and Epilepsy—Analogy of the Sexual Impulse to Hunger—Final Object of the Impulses of Tumescence and Detumescence.

The Chief Key to the Relationship between Love and Pain to be Found in Animal Courtship—Courtship a Source of Combativity and of Cruelty—Human Play in the Light of Animal Courtship—The Frequency of Crimes Against the Person in Adolescence—Marriage by Capture and its Psychological Basis—Man's Pleasure in Exerting Force and Woman's Pleasure in Experiencing it—Resemblance of Love to Pain even in Outward Expression—The Love-bite—In What Sense Pain May be Pleasurable—The Natural Contradiction in the Emotional Attitude of Women Toward Men—Relative Insensibility to Pain of the Organic Sexual Sphere in Women—The Significance of the Use of the Ampallang and Similar Appliances in Coitus—The Sexual Subjection of Women to Men in Part Explainable as the Necessary Condition for Sexual Pleasure.

The Definition of Sadism—De Sade—Masochism to some Extent Normal—Sacher-Masoch—No Real Line of Demarcation between Sadism and Masochism—Algolagnia Includes Both Groups of Manifestations—The Love-bite as a Bridge from Normal Phenomena to Algolagnia—The Fascination of Blood—The Most Extreme Perversions are Linked on to Normal Phenomena.

Flagellation as a Typical Illustration of Algolagnia—Causes of Connection between Sexual Emotion and Whipping—Physical Causes—Psychic Causes Probably More Important—The Varied Emotional Associations of Whipping—Its Wide Prevalence.

The Impulse to Strangle the Object of Sexual Desire—The Wish to be Strangled. Respiratory Disturbance the Essential Element in this Group of Phenomena—The Part Played by Respiratory Excitement in the Process of Courtship—Swinging and Suspension—The Attraction Exerted by the Idea of being Chained and Fettered.

Pain, and not Cruelty, the Essential Element in Sadism and Masochism—Pain Felt as Pleasure—Does the Sadist Identify Himself with the Feelings of his Victim?—The Sadist Often a Masochist in Disguise—The Spectacle of Pain or Struggle as a Sexual Stimulant.

Why is Pain a Sexual Stimulant?—It is the Most Effective Method of Arousing Emotion—Anger and Fear the Most Powerful Emotions—Their Biological Significance in Courtship—Their General and Special Effects in Stimulating the Organism—Grief as a Sexual Stimulant—The Physiological Mechanism of Fatigue Renders Pain Pleasurable.

Summary of Results Reached—The Joy of Emotional Expansion—The Satisfaction of the Craving for Power—The Influence of Neurasthenic and Neuropathic Conditions—The Problem of Pain in Love Largely Constitutes a Special Case of Erotic Symbolism.

The Primitive View of Women—As a Supernatural Element in Life—As Peculiarly Embodying the Sexual Instinct—The Modern Tendency to Underestimate the Sexual Impulse in Women—This Tendency Confined to Recent Times—Sexual Anæsthesia—Its Prevalence—Difficulties in Investigating the Subject—Some Attempts to Investigate it—Sexual Anæsthesia Must be Regarded as Abnormal—The Tendency to Spontaneous Manifestations of the Sexual Impulse in Young Girls at Puberty.

Special Characters of the Sexual Impulse in Women—The More Passive Part Played by Women in Courtship—This Passivity Only Apparent—The Physical Mechanism of the Sexual Process in Women More Complex—The Slower Development of Orgasm in Women—The Sexual Impulse in Women More Frequently Needs to be Actively Aroused—The Climax of Sexual Energy Falls Later in Women's Lives than in Men's—Sexual Ardor in Women increased After the Establishment of Sexual Relationships—Women Bear Sexual Excesses Better than Men—The Sexual Sphere Larger and More Diffused in Women—The Sexual Impulse in Women Shows a Greater Tendency to Periodicity and a Wider Range of Variation.

Summary of Conclusions.

The External Sensory Stimuli Affecting Selection in Man. The Four Senses Involved.

The Primitive Character of the Skin. Its Qualities. Touch the Earliest Source of Sensory Pleasure. The Characteristics of Touch. As the Alpha and Omega of Affection. The Sexual Organs a Special Adaptation of Touch. Sexual Attraction as Originated by Touch. Sexual Hyperæsthesia to Touch. The Sexual Associations of Acne.

Ticklishness. Its Origin and Significance. The Psychology of Tickling. Laughter. Laughter as a Kind of Detumescence. The Sexual Relationships of Itching. The Pleasure of Tickling. Its Decrease with Age and Sexual Activity.

The Secondary Sexual Skin Centres. Orificial Contacts. Cunnilingus and Fellatio. The Kiss. The Nipples. The Sympathy of the Breasts with the Primary Sexual Centres. This Connection Operative both through the Nerves and through the Blood. The Influence of Lactation on the Sexual Centres. Suckling and Sexual Emotion. The Significance of the Association between Suckling and Sexual Emotion. The Association as a Cause of Sexual Perversity.

The Bath. Antagonism of Primitive Christianity to the Cult of the Skin. Its Cult of Personal Filth. The Reasons which Justified this Attitude. The World-wide Tendency to Association between Extreme Cleanliness and Sexual Licentiousness. The Immorality Associated with Public Baths in Europe down to Modern Times.

Summary. Fundamental Importance of Touch. The Skin the Mother of All the Other Senses.

The Primitiveness of Smell. The Anatomical Seat of the Olfactory Centres. Predominance of Smell among the Lower Mammals. Its Diminished Importance in Man. The Attention Paid to Odors by Savages.

Rise of the Study of Olfaction. Cloquet. Zwaardemaker. The Theory of Smell. The Classification of Odors. The Special Characteristics of Olfactory Sensation in Man. Smell as the Sense of Imagination. Odors as Nervous Stimulants. Vasomotor and Muscular Effects. Odorous Substances as Drugs.

The Specific Body Odors of Various Peoples. The Negro, etc. The European. The Ability to Distinguish Individuals by Smell. The Odor of Sanctity. The Odor of Death. The Odors of Different Parts of the Body. The Appearance of Specific Odors at Puberty. The Odors of Sexual Excitement. The Odors of Menstruation. Body Odors as a Secondary Sexual Character. The Custom of Salutation by Smell. The Kiss. Sexual Selection by Smell. The Alleged Association between Size of Nose and Sexual Vigor. The Probably Intimate Relationship between the Olfactory and Genital Spheres. Reflex Influences from the Nose. Reflex Influences from the Genital Sphere. Olfactory Hallucinations in Insanity as Related to Sexual States. The Olfactive Type. The Sense of Smell in Neurasthenic and Allied States. In Certain Poets and Novelists. Olfactory Fetichism. The Part Played by Olfaction in Normal Sexual Attraction. In the East, etc. In Modern Europe. The Odor of the Armpit and its Variations. As a Sexual and General Stimulant. Body Odors in Civilization Tend to Cause Sexual Antipathy unless some Degree of Tumescence is Already Present. The Question whether Men or Women are more Liable to Feel Olfactory Influences. Women Usually more Attentive to Odors. The Special Interest in Odors Felt by Sexual Inverts.

The Influence of Perfumes. Their Aboriginal Relationship to Sexual Body Odors. This True even of the Fragrance of Flowers. The Synthetic Manufacture of Perfumes. The Sexual Effects of Perfumes. Perfumes perhaps Originally Used to Heighten the Body Odors. The Special Significance of the Musk Odor. Its Wide Natural Diffusion in Plants and Animals and Man. Musk a Powerful Stimulant. Its Widespread Use as a Perfume. Peau d'Espagne. The Smell of Leather and its Occasional Sexual Effects. The Sexual Influence of the Odors of Flowers. The Identity of many Plant Odors with Certain Normal and Abnormal Body Odors. The Smell of Semen in this Connection.

The Evil Effects of Excessive Olfactory Stimulation. The Symptoms of Vanillism. The Occasional Dangerous Results of the Odors of Flowers. Effects of Flowers on the Voice.

The Place of Smell in Human Sexual Selections. It has given Place to the Predominance of Vision largely because in Civilized Man it Fails to Act at a Distance. It still Plays a Part by Contributing to the Sympathies or the Antipathies of Intimate Contact.

The Physiological Basis of Rhythm. Rhythm as a Physiological Stimulus. The Intimate Relation of Rhythm to Movement. The Physiological Influence of Music on Muscular Action, Circulation, Respiration, etc. The Place of Music in Sexual Selection among the Lower Animals. Its Comparatively Small Place in Courtship among Mammals. The Larynx and Voice in Man. The Significance of the Pubertal Changes. Ancient Beliefs Concerning the Influence of Music in Morals, Education and Medicine. Its Therapeutic Uses. Significance of the Romantic Interest in Music at Puberty. Men Comparatively Insusceptible to the Specifically Sexual Influence of Music. Rarity of Sexual Perversions on the Basis of the Sense of Hearing. The Part of Music in Primitive Human Courtship. Women Notably Susceptible to the Specifically Sexual Influence of Music and the Voice.

Summary. Why the Influence of Music in Human Sexual Selection is Comparatively Small.

Primacy of Vision in Man. Beauty as a Sexual Allurement. The Objective Element in Beauty. Ideals of Feminine Beauty in Various Parts of the World. Savage Women sometimes Beautiful from European Point of View. Savages often Admire European Beauty. The Appeal of Beauty to some Extent Common even to Animals and Man.

Beauty to Some Extent Consists Primitively in an Exaggeration of the Sexual Characters. The Sexual Organs. Mutilations, Adornments, and Garments. Sexual Allurement the Original Object of Such Devices. The Religious Element. Unæsthetic Character of the Sexual Organs. Importance of the Secondary Sexual Characters. The Pelvis and Hips. Steatopygia. Obesity. Gait. The Pregnant Woman as a Mediæval Type of Beauty. The Ideals of the Renaissance. The Breasts. The Corset. Its Object. Its History. Hair. The Beard. The Element of National or Racial Type in Beauty. The Relative Beauty of Blondes and Brunettes. The General European Admiration for Blondes. The Individual Factors in the Constitution of the Idea of Beauty. The Love of the Exotic.

Beauty Not the Sole Element in the Sexual Appeal of Vision. Movement. The Mirror. Narcissism. Pygmalionism. Mixoscopy. The Indifference of Women to Male Beauty. The Significance of Woman's Admiration of Strength. The Spectacle of Strength is a Tactile Quality made Visible.

The Alleged Charm of Disparity in Sexual Attraction. The Admiration for High Stature. The Admiration for Dark Pigmentation. The Charm of Parity. Conjugal Mating. The Statistical Results of Observation as Regards General Appearance, Stature, and Pigmentation of Married Couples. Preferential Mating and Assortative Mating. The Nature of the Advantage Attained by the Fair in Sexual Selection. The Abhorrence of Incest and the Theories of its Cause. The Explanation in Reality Simple. The Abhorrence of Incest in Relation to Sexual Selection. The Limits to the Charm of Parity in Conjugal Mating. The Charm of Disparity in Secondary Sexual Characters.

Summary of the Conclusions at Present Attainable in Regard to the Nature of Beauty and its Relation to Sexual Selection.

The Definition of Erotic Symbolism. Symbolism of Act and Symbolism of Object. Erotic Fetichism. Wide Extension of the Symbols of Sex. The Immense Variety of Possible Erotic Fetiches. The Normal Foundations of Erotic Symbolism. Classification of the Phenomena. The Tendency to Idealize the Defects of a Beloved Person. Stendhal's "Crystallization"

Foot-fetichism and Shoe-fetichism. Wide Prevalence and Normal Basis. Restif de la Bretonne. The Foot a Normal Focus of Sexual Attraction Among Some Peoples. The Chinese, Greeks, Romans, Spaniards, etc. The Congenital Predisposition in Erotic Symbolism. The Influence of Early Association and Emotional Shock. Shoe-fetichism in Relation to Masochism. The Two Phenomena Independent Though Allied. The Desire to be Trodden On. The Fascination of Physical Constraint. The Symbolism of Self-inflicted Pain. The Dynamic Element in Erotic Symbolism. The Symbolism of Garments.

Scatalogic Symbolism. Urolagnia. Coprolagnia. The Ascetic Attitude Towards the Flesh. Normal Basis of Scatalogic Symbolism. Scatalogic Conceptions Among Primitive Peoples. Urine as a Primitive Holy Water. Sacredness of Animal Excreta. Scatalogy in Folk-lore. The Obscene as Derived from the Mythological. The Immature Sexual Impulse Tends to Manifest Itself in Scatalogic Forms. The Basis of Physiological Connection Between the Urinary and Genital Spheres. Urinary Fetichism Sometimes Normal in Animals. The Urolagnia of Masochists. The Scatalogy of Saints. Urolagnia More Often a Symbolism of Act Than a Symbolism of Object. Only Occasionally an Olfactory Fetichism. Comparative Rarity of Coprolagnia. Influence of Nates Fetichism as a Transition to Coprolagnia, Ideal Coprolagnia. Olfactory Coprolagnia. Urolagnia and Coprolagnia as Symbols of Coitus.

Animals as Sources of Erotic Symbolism. Mixoscopic Zoophilia. The Stuff-fetichisms. Hair-fetichism. The Stuff-fetichisms Mainly on a Tactile Base. Erotic Zoophilia. Zooerastia. Bestiality. The Conditions that Favor Bestiality. Its Wide Prevalence Among Primitive Peoples and Among Peasants. The Primitive Conception of Animals. The Goat. The Influence of Familiarity With Animals. Congress Between Women and Animals. The Social Reaction Against Bestiality.

Exhibitionism. Illustrative Cases. A Symbolic Perversion of Courtship. The Impulse to Defile. The Exhibitionist's Psychic Attitude. The Sexual Organs as Fetiches. Phallus Worship. Adolescent Pride in Sexual Development. Exhibitionism of the Nates. The Classification of the Forms of Exhibitionism. Nature of the Relationship of Exhibitionism to Epilepsy.

The Forms of Erotic Symbolism are Simulacra of Coitus. Wide Extension of Erotic Symbolism. Fetichism Not Covering the Whole Ground of Sexual Selection. It is Based on the Individual Factor in Selection. Crystallization. The Lover and the Artist. The Key to Erotic Symbolism is to be Found in the Emotional Sphere. The Passage to Pathological Extremes.

The Psychological Significance of Detumescence. The Testis and the Ovary. Sperm Cell and Germ Cell. Development of the Embryo. The External Sexual Organs. Their Wide Range of Variation. Their Nervous Supply. The Penis. Its Racial Variations. The Influence of Exercise. The Scrotum and Testicles. The Mons Veneris. The Vulva. The Labia Majora and their Varieties. The Public Hair and Its Characters. The Clitoris and Its Functions. The Anus as an Erogenous Zone. The Nymphæ and their Function. The Vagina. The Hymen. Virginity. The Biological Significance of the Hymen.

The Object of Detumescence. Erogenous Zones. The Lips. The Vascular Characters of Detumescence. Erectile Tissue. Erection in Woman. Mucous Emission in Women. Sexual Connection. The Human Mode of Intercourse. Normal Variations. The Motor Characters of Detumescence. Ejaculation. The Virile Reflex. The General Phenomena of Detumescence. The Circulatory and Respiratory Phenomena. Blood Pressure. Cardiac Disturbance. Glandular Activity. Distillatio. The Essentially Motor Character of Detumescence. Involuntary Muscular Irradiation to Bladder, etc. Erotic Intoxication. Analogy of Sexual Detumescence and Vesical Tension. The Specifically Sexual Movements of Detumescence in Man. In Woman. The Spontaneous Movements of the Genital Canal in Woman. Their Function in Conception. Part Played by Active Movement of the Spermatozoa. The Artificial Injection of Semen. The Facial Expression During Detumescence. The Expression of Joy. The Occasional Serious Effects of Coitus.

The Constituents of Semen. Function of the Prostate. The Properties of Semen. Aphrodisiacs. Alcohol, Opium, etc. Anaphrodisiacs. The Stimulant Influence of Semen in Coitus. The Internal Effects of Testicular Secretions. The Influence of Ovarian Secretion.

The Aptitude for Detumescence. Is There an Erotic Temperament? The Available Standards of Comparison. Characteristics of the Castrated. Characteristics of Puberty. Characteristics of the State of Detumescence. Shortness of Stature. Development of the Secondary Sexual Characters. Deep Voice. Bright Eyes. Glandular Activity. Everted Lips. Pigmentation. Profuse Hair. Dubious Significance of Many of These Characters.

The Relationship of Maternal and Sexual Emotion. Conception and Loss of Virginity. The Anciently Accepted Signs of This Condition. The Pervading Effects of Pregnancy on the Organism. Pigmentation. The Blood and Circulation. The Thyroid. Changes in the Nervous System. The Vomiting of Pregnancy. The Longings of Pregnant Women. Mental Impressions. Evidence for and Against Their Validity. The Question Still Open. Imperfection of Our Knowledge. The Significance of Pregnancy.

The Child's Right to Choose Its Ancestry—How This is Effected—The Mother the Child's Supreme Parent—Motherhood and the Woman Movement—The Immense Importance of Motherhood—Infant Mortality and Its Causes—The Chief Cause in the Mother—The Need of Rest During Pregnancy—Frequency of Premature Birth—The Function of the State—Recent Advance in Puericulture—The Question of Coitus During Pregnancy—The Need of Rest During Lactation—The Mother's Duty to Suckle Her Child—The Economic Question—The Duty of the State—Recent Progress in the Protection of the Mother—The Fallacy of State Nurseries.

Nurture Necessary as Well as Breed—Precocious Manifestations of the Sexual Impulse—Are they to be Regarded as Normal?—The Sexual Play of Children—The Emotion of Love in Childhood—Are Town Children More Precocious Sexually Than Country Children?—Children's Ideas Concerning the Origin of Babies—Need for Beginning the Sexual Education of Children in Early Years—The Importance of Early Training in Responsibility—Evil of the Old Doctrine of Silence in Matters of Sex—The Evil Magnified When Applied to Girls—The Mother the Natural and Best Teacher—The Morbid Influence of Artificial Mystery in Sex Matters—Books on Sexual Enlightenment of the Young—Nature of the Mother's Task—Sexual Education in the School—The Value of Botany—Zoölogy—Sexual Education After Puberty—The Necessity of Counteracting Quack Literature—Danger of Neglecting to Prepare for the First Onset of Menstruation—The Right Attitude Towards Woman's Sexual Life—The Vital Necessity of the Hygiene of Menstruation During Adolescence—Such Hygiene Compatible with the Educational and Social Equality of the Sexes—The Invalidism of Women Mainly Due to Hygienic Neglect—Good Influence of Physical Training on Women and Bad Influence of Athletics—The Evils of Emotional Suppression—Need of Teaching the Dignity of Sex—Influence of These Factors on a Woman's Fate in Marriage—Lectures and Addresses on Sexual Hygiene—The Doctor's Part in Sexual Education—Pubertal Initiation Into the Ideal World—The Place of the Religious and Ethical Teacher—The Initiation Rites of Savages Into Manhood and Womanhood—The Sexual Influence of Literature—The Sexual Influence of Art.

The Greek Attitude Towards Nakedness—How the Romans Modified That Attitude—The Influence of Christianity—Nakedness in Mediæval Times—Evolution of the Horror of Nakedness—Concomitant Change in the Conception of Nakedness—Prudery—The Romantic Movement—Rise of a New Feeling in Regard to Nakedness—The Hygienic Aspect of Nakedness—How Children May Be Accustomed to Nakedness—Nakedness Not Inimical to Modesty—The Instinct of Physical Pride—The Value of Nakedness in Education—The Æsthetic Value of Nakedness—The Human Body as One of the Prime Tonics of Life—How Nakedness May Be Cultivated—The Moral Value of Nakedness.

The Conception of Sexual Love—The Attitude of Mediæval Asceticism—St. Bernard and St. Odo of Cluny—The Ascetic Insistence on the Proximity of the Sexual and Excretory Centres—Love as a Sacrament of Nature—The Idea of the Impurity of Sex in Primitive Religions Generally—Theories of the Origin of This Idea—The Anti-Ascetic Element in the Bible and Early Christianity—Clement of Alexandria—St. Augustine's Attitude—The Recognition of the Sacredness of the Body by Tertullian, Rufinus and Athanasius—The Reformation—The Sexual Instinct Regarded as Beastly—The Human Sexual Instinct Not Animal-like—Lust and Love—The Definition of Love—Love and Names for Love Unknown in Some Parts of the World—Romantic Love of Late Development in the White Race—The Mystery of Sexual Desire—Whether Love is a Delusion—The Spiritual as Well as the Physical Structure of the World in Part Built up on Sexual Love The Testimony of Men of Intellect to the Supremacy of Love.

Chastity Essential to the Dignity of Love—The Eighteenth Century Revolt Against the Ideal of Chastity—Unnatural Forms of Chastity—The Psychological Basis of Asceticism—Asceticism and Chastity as Savage Virtues—The Significance of Tahiti—Chastity Among Barbarous Peoples—Chastity Among the Early Christians—Struggles of the Saints with the Flesh—The Romance of Christian Chastity—Its Decay in Mediæval Times—Aucassin et Nicolette and the New Romance of Chaste Love—The Unchastity of the Northern Barbarians—The Penitentials—Influence of the Renaissance and the Reformation—The Revolt Against Virginity as a Virtue—The Modern Conception of Chastity as a Virtue—The Influences That Favor the Virtue of Chastity—Chastity as a Discipline—The Value of Chastity for the Artist—Potency and Impotence in Popular Estimation—The Correct Definitions of Asceticism and Chastity.

The Influence of Tradition—The Theological Conception of Lust—Tendency of These Influences to Degrade Sexual Morality—Their Result in Creating the Problem of Sexual Abstinence—The Protests Against Sexual Abstinence—Sexual Abstinence and Genius—Sexual Abstinence in Women—The Advocates of Sexual Abstinence—Intermediate Attitude—Unsatisfactory Nature of the Whole Discussion—Criticism of the Conception of Sexual Abstinence—Sexual Abstinence as Compared to Abstinence from Food—No Complete Analogy—The Morality of Sexual Abstinence Entirely Negative—Is It the Physician's Duty to Advise Extra-Conjugal Sexual Intercourse?—Opinions of Those Who Affirm or Deny This Duty—The Conclusion Against Such Advice—The Physician Bound by the Social and Moral Ideas of His Age—The Physician as Reformer—Sexual Abstinence and Sexual Hygiene—Alcohol—The Influence of Physical and Mental Exercise—The Inadequacy of Sexual Hygiene in This Field—The Unreal Nature of the Conception of Sexual Abstinence—The Necessity of Replacing It by a More Positive Ideal.

The Orgy:—The Religious Origin of the Orgy—The Feast of Fools—Recognition of the Orgy by the Greeks and Romans—The Orgy Among Savages—The Drama—The Object Subserved by the Orgy.

The Origin and Development of Prostitution:—The Definition of Prostitution—Prostitution Among Savages—The Conditions Under Which Professional Prostitution Arises—Sacred Prostitution—The Rite of Mylitta—The Practice of Prostitution to Obtain a Marriage Portion—The Rise of Secular Prostitution in Greece—Prostitution in the East—India, China, Japan, etc.—Prostitution in Rome—The Influence of Christianity on Prostitution—The Effort to Combat Prostitution—The Mediæval Brothel—The Appearance of the Courtesan—Tullia D'Aragona—Veronica Franco—Ninon de Lenclos—Later Attempts to Eradicate Prostitution—The Regulation of Prostitution—Its Futility Becoming Recognized.

The Causes of Prostitution:—Prostitution as a Part of the Marriage System—The Complex Causation of Prostitution—The Motives Assigned by Prostitutes—(1) Economic Factor of Prostitution—Poverty Seldom the Chief Motive for Prostitution—But Economic Pressure Exerts a Real Influence—The Large Proportion of Prostitutes Recruited from Domestic Service—Significance of This Fact—(2) The Biological Factor of Prostitution—The So-called Born-Prostitute—Alleged Identity with the Born-Criminal—The Sexual Instinct in Prostitutes—The Physical and Psychic Characters of Prostitutes—(3) Moral Necessity as a Factor in the Existence of Prostitution—The Moral Advocates of Prostitution—The Moral Attitude of Christianity Towards Prostitution—The Attitude of Protestantism—Recent Advocates of the Moral Necessity of Prostitution—(4) Civilizational Value as a Factor of Prostitution—The Influence of Urban Life—The Craving for Excitement—Why Servant-girls so Often Turn to Prostitution—The Small Part Played by Seduction—Prostitutes Come Largely from the Country—The Appeal of Civilization Attracts Women to Prostitution—The Corresponding Attraction Felt by Men—The Prostitute as Artist and Leader of Fashion—The Charm of Vulgarity.

The Present Social Attitude Towards Prostitution:—The Decay of the Brothel—The Tendency to the Humanization of Prostitution—The Monetary Aspects of Prostitution—The Geisha—The Hetaira—The Moral Revolt Against Prostitution—Squalid Vice Based on Luxurious Virtue—The Ordinary Attitude Towards Prostitutes—Its Cruelty Absurd—The Need of Reforming Prostitution—The Need of Reforming Marriage—These Two Needs Closely Correlated—The Dynamic Relationships Involved.

The Significance of the Venereal Diseases—The History of Syphilis—The Problem of Its Origin—The Social Gravity of Syphilis—The Social Dangers of Gonorrhœa—The Modern Change in the Methods of Combating Venereal Diseases—Causes of the Decay of the System of Police Regulation—Necessity of Facing the Facts—The Innocent Victims of Venereal Diseases—Diseases Not Crimes—The Principle of Notification—The Scandinavian System—Gratuitous Treatment—Punishment For Transmitting Venereal Diseases—Sexual Education in Relation to Venereal Diseases—Lectures, Etc.—Discussion in Novels and on the Stage—The "Disgusting" Not the "Immoral".

Prostitution in Relation to Our Marriage System—Marriage and Morality—The Definition of the Term "Morality"—Theoretical Morality—Its Division Into Traditional Morality and Ideal Morality—Practical Morality—Practical Morality Based on Custom—The Only Subject of Scientific Ethics—The Reaction Between Theoretical and Practical Morality—Sexual Morality in the Past an Application of Economic Morality—The Combined Rigidity and Laxity of This Morality—The Growth of a Specific Sexual Morality and the Evolution of Moral Ideals—Manifestations of Sexual Morality—Disregard of the Forms of Marriage—Trial Marriage—Marriage After Conception of Child—Phenomena in Germany, Anglo-Saxon Countries, Russia, etc.—The Status of Woman—The Historical Tendency Favoring Moral Equality of Women with Men—The Theory of the Matriarchate—Mother-Descent—Women in Babylonia—Egypt—Rome—The Eighteenth and Nineteenth Centuries—The Historical Tendency Favoring Moral Inequality of Woman—The Ambiguous Influence of Christianity—Influence of Teutonic Custom and Feudalism—Chivalry—Woman in England—The Sale of Wives—The Vanishing Subjection of Woman—Inaptitude of the Modern Man to Domineer—The Growth of Moral Responsibility in Women—The Concomitant Development of Economic Independence—The Increase of Women Who Work—Invasion of the Modern Industrial Field by Women—In How Far This Is Socially Justifiable—The Sexual Responsibility of Women and Its Consequences—The Alleged Moral Inferiority of Women—The "Self-Sacrifice" of Women—Society Not Concerned with Sexual Relationships—Procreation the Sole Sexual Concern of the State—The Supreme Importance of Maternity.

The Definition of Marriage—Marriage Among Animals—The Predominance of Monogamy—The Question of Group Marriage—Monogamy a Natural Fact, Not Based on Human Law—The Tendency to Place the Form of Marriage Above the Fact of Marriage—The History of Marriage—Marriage in Ancient Rome—Germanic Influence on Marriage—Bride-Sale—The Ring—The Influence of Christianity on Marriage—The Great Extent of this Influence—The Sacrament of Matrimony—Origin and Growth of the Sacramental Conception—The Church Made Marriage a Public Act—Canon Law—Its Sound Core—Its Development—Its Confusions and Absurdities—Peculiarities of English Marriage Law—Influence of the Reformation on Marriage—The Protestant Conception of Marriage as a Secular Contract—The Puritan Reform of Marriage—Milton as the Pioneer of Marriage Reform—His Views on Divorce—The Backward Position of England in Marriage Reform—Criticism of the English Divorce Law—Traditions of the Canon Law Still Persistent—The Question of Damages for Adultery—Collusion as a Bar to Divorce—Divorce in France, Germany, Austria, Russia, etc.—The United States—Impossibility of Deciding by Statute the Causes for Divorce—Divorce by Mutual Consent—Its Origin and Development—Impeded by the Traditions of Canon Law—Wilhelm von Humboldt—Modern Pioneer Advocates of Divorce by Mutual Consent—The Arguments Against Facility of Divorce—The Interests of the Children—The Protection of Women—The Present Tendency of the Divorce Movement—Marriage Not a Contract—The Proposal of Marriage for a Term of Years—Legal Disabilities and Disadvantages in the Position of the Husband and the Wife—Marriage Not a Contract But a Fact—Only the Non-Essentials of Marriage, Not the Essentials, a Proper Matter for Contract—The Legal Recognition of Marriage as a Fact Without Any Ceremony—Contracts of the Person Opposed to Modern Tendencies—The Factor of Moral Responsibility—Marriage as an Ethical Sacrament—Personal Responsibility Involves Freedom—Freedom the Best Guarantee of Stability—False Ideas of Individualism—Modern Tendency of Marriage—With the Birth of a Child Marriage Ceases to be a Private Concern—Every Child Must Have a Legal Father and Mother—How This Can be Effected—The Firm Basis of Monogamy—The Question of Marriage Variations—Such Variations Not Inimical to Monogamy—The Most Common Variations—The Flexibility of Marriage Holds Variations in Check—Marriage Variations versus Prostitution—Marriage on a Reasonable and Humane Basis—Summary and Conclusion.

Marriage Not Only for Procreation—Theologians on the Sacramentum Solationis—Importance of the Art of Love—The Basis of Stability in Marriage and the Condition for Right Procreation—The Art of Love the Bulwark Against Divorce—The Unity of Love and Marriage a Principle of Modern Morality—Christianity and the Art of Love—Ovid—The Art of Love Among Primitive Peoples—Sexual Initiation in Africa and Elsewhere—The Tendency to Spontaneous Development of the Art of Love in Early Life—Flirtation—Sexual Ignorance in Women—The Husband's Place in Sexual Initiation—Sexual Ignorance in Men—The Husband's Education for Marriage—The Injury Done by the Ignorance of Husbands—The Physical and Mental Results of Unskilful Coitus—Women Understand the Art of Love Better Than Men—Ancient and Modern Opinions Concerning Frequency of Coitus—Variation in Sexual Capacity—The Sexual Appetite—The Art of Love Based on the Biological Facts of Courtship—The Art of Pleasing Women—The Lover Compared to the Musician—The Proposal as a Part of Courtship—Divination in the Art of Love—The Importance of the Preliminaries in Courtship—The Unskilful Husband Frequently the Cause of the Frigid Wife—The Difficulty of Courtship—Simultaneous Orgasm—The Evils of Incomplete Gratification in Women—Coitus Interruptus—Coitus Reservatus—The Human Method of Coitus—Variations in Coitus—Posture in Coitus—The Best Time for Coitus—The Influence of Coitus in Marriage—The Advantages of Absence in Marriage—The Risks of Absence—Jealousy—The Primitive Function of Jealousy—Its Predominance Among Animals, Savages, etc, and in Pathological States—An Anti-Social Emotion—Jealousy Incompatible With the Progress of Civilization—The Possibility of Loving More Than One Person at a Time—Platonic Friendship—The Conditions Which Make It Possible—The Maternal Element in Woman's Love—The Final Development of Conjugal Love—The Problem of Love One of the Greatest Of Social Questions.

The Relationship of the Science of Procreation to the Art of Love—Sexual Desire and Sexual Pleasure as the Conditions of Conception—Reproduction Formerly Left to Caprice and Lust—The Question of Procreation as a Religious Question—The Creed of Eugenics—Ellen Key and Sir Francis Galton—Our Debt to Posterity—The Problem of Replacing Natural Selection—The Origin and Development of Eugenics—The General Acceptance of Eugenical Principles To-day—The Two Channels by Which Eugenical Principles are Becoming Embodied in Practice—The Sense of Sexual Responsibility in Women—The Rejection of Compulsory Motherhood—The Privilege of Voluntary Motherhood—Causes of the Degradation of Motherhood—The Control of Conception—Now Practiced by the Majority of the Population in Civilized Countries—The Fallacy of "Racial Suicide"—Are Large Families a Stigma of Degeneration?—Procreative Control the Outcome of Natural and Civilized Progress—The Growth of Neo-Malthusian Beliefs and Practices—Facultative Sterility as Distinct from Neo-Malthusianism—The Medical and Hygienic Necessity of Control of Conception—Preventive Methods—Abortion—The New Doctrine of the Duty to Practice Abortion—How Far is this Justifiable?—Castration as a Method of Controlling Procreation—Negative Eugenics and Positive Eugenics—The Question of Certificates for Marriage—The Inadequacy of Eugenics by Act of Parliament—The Quickening of the Social Conscience in Regard to Heredity—Limitations to the Endowment of Motherhood—The Conditions Favorable to Procreation—Sterility—The Question of Artificial Fecundation—The Best Age of Procreation—The Question of Early Motherhood—The Best Time for Procreation—The Completion of the Divine Cycle of Life.