Masochism, submission to pain, in men, in women, sadism, platonic sadism, four degrees in men, in women, fetichism, in men, in women, exhibitionism, homosexuality, in animals, in savages, in history, in men, in women, perversity, four kinds homosexual perversion, psychic hermaphrodism, in men, in women, effemination, viraginity, transvestism, in men, in women, zoöerastia in men, in women. PART VII: SEXUAL HYGIENE. _Chapter 19—Hygiene of childhood._ Necessity of early instruction, hygiene in infants, in children, in period of puberty, menstruation, pollutions, prevention of masturbation, syphilis, gonorrhoea, prostitution, alcohol, vanity, pleasure-seeking, prophylaxis against infection. _Chapter 20—Eugenics._ Aim of eugenics, methods of elimination of the undesirables, marriage of defectives, personal liberty in marriage, segregation, sterilization, castration. _Chapter 21—Sex-hygiene for adults._ Engagement-rules, selection of partner, wedding day, bed-room, positions of conjugation, frequency of conjugation, sequels of great frequency, in general health, in special organs, in the emotions, in sex pleasure, pain of defloration, conjugation during menstruation, conjugation during pregnancy, after confinement, conjugation during lactation, conjugation of nervous people, duration of conjugation, preparation of the woman’s muliebria in partial frigidity, offspring and sexual life, interval between two confinements, sterile time for conjugation, time of day for conjugation, dispareunia, impeditio of conception, sequels of withdrawals, of preventatives, abortion, abstinence, means of sexual excitement. PART VIII: MORALITY. _Chapter 22—Standard of morality._ Moral standard of revealed religion, law, ethics, custom, Supreme Intelligence, chaos in morality, economic determinism, the superman, ethics and work, morality of love, philosophy of pleasure, moral standard in nature, rationality in nature, aim of nature, altruism and morality. _Chapter 23—Sexual morality._ History of marriage, promiscuity, consanguineous family, punaluan family, pairing family, patriarchal family, female chastity, adultery, law of obstacles, modesty, coyness, female morality and reason. _Chapter 24—Male chastity._ Two reasons for male chastity, syphilis and gonorrhoea, prevalence of gonorrhoea in men, infection of mothers and children, sterility, syphilis, its complications, alimentary canal, respiratory tract, circulatory system, genito-urinary system, skeleton, muscles, nervous system, prostitution, clandestine vice, injury of abstinence, ethics of evolution. LOVE PART I. INTRODUCTION