V. 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. VI. 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 MECHANISM OF DETUMESCENCE. I. 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. II 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. III. 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. IV. 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.