Sigmund Freud is the founding father of psychoanalysis. In this volume, Freud's writings focus on human sexuality - an open examination of the psychology of sexual diversity and its psychological significance. Developmental phases of sexuality, the taboo of virginity, the pleasure principle, fetishism, bisexuality, anal eroticism, masturbation, the libido theory, cultural sexual morality, sexuality and perversion, sadism and masochism, and further insights.