The autoerotic activity of the erogenous zones in children is the same in both sexes. It may be asserted, says Freud, that the sexuality of the little girl has entirely a male character. The chief erogenous zone in the female child is the clitoris which is homologous to the male penis. The frequent spontaneous discharges of sexual excitement in little girls manifest themselves in twitching and erections of the clitoris. But while in the male the erogenous zone remains the same after puberty as before, namely in the penis, puberty is distinguished in the girl by a wave of repression of the clitoris-sexuality and in the change of the erogenous zones. The rôle of the clitoris is henceforth to conduct the excitation to the adjacent parts. It often takes some time to affect this transference. During this time the young woman remains anaesthetic to stimulations of the internal organs as vagina or cervix. This anaesthesia may become permanent if the clitoris zone refuses to transfer its excitability. This anaesthesia in women is often only apparent and local. They are anaesthetic at the vagina and cervix, but not at all unexcitable through the clitoris or even through other erogenous zones, such as the lips or the nipples. The women are impotent of experiencing libido in coition but potent when the clitoris is excited by any other stimuli. The refusal to transfer the clitoris sexuality is, as a rule, caused by an excessive irritation of the clitoris by manusturpation during childhood. The excesses which cause impotence of libido in women are the same which cause impotence of copulation in men, namely excesses in copulation, masturbation, mental erethism, and tactile eroticism. In women the excesses in copulation are more harmful than in men. While in men these excesses are self-limited by the impossibility of provoking any erections, after a certain time of continuous indulgence; in women there is no limitation to the practice. Playing the passive rôle, she can stand congressum continuum for a considerable length of time and tire out a number of men in succession. The vaginal pavement-epithelial lining is very strong. “Conteritur ferrum, silices teneantur ab usu. “Sufficit et damni pars caret illa metu.” sings Ovid in his “Ars Amandi.” Hence when a woman has any proclivity for excesses in initu, there is no natural limit to her indulgence. Through the influence of the frequent irritation in copulative excesses, the vaginal mucous membrane undergoes considerable changes. It becomes a veritable skin, a stiff parchment, and thus loses sensitiveness.