The development of sexuality may be conceived, broadly, as follows: the first stage is autoerotic, although all-erotic stimuli are also present (suckling at the mother’s breast, caressing of the infant, etc.). The child is more sensitive to all forms of excitation and all vegetative functions are surcharged with pleasurable feelings more strongly in him than in the adult. Sexual life is autoerotic, but it is bisexually autoerotic. The child makes no distinction between the persons to whom it is attached. Young or old, male or female,—it is all alike to him. But autoerotism is characteristic of this sexual life. Gradually this feature is overshadowed by the appearance of the all-erotic tendency. At first the child seeks to find the goal for its sexuality among the possible objects of his limited surroundings. Just as the first period of autoerotism is overcome so the normal fixation upon one’s family must be eventually outgrown. (Thou shalt leave thy father and thy mother and follow thine husband!) But even during the earliest period all libidinous excitations are distinctly bisexual. This bisexuality persists until the period of puberty, that is, throughout that stage of sexual indifference, of which _Desoir_ also speaks. But the tendency to bisexuality is unable to withstand the powerful stress of puberty. The girlish boy becomes a man, the tomboy girl becomes a young woman. The development of the secondary sexual characters displace man’s heterosexual characteristics with the stamp of monosexuality. Usually at this time there develops also a decisive struggle against homosexuality leading, sooner or later, to the complete suppression of that tendency. (Naturally there are exceptions, as some persons retain their bisexual character traits without trouble throughout life.) _I have not examined a person thus far in whom I failed to recognise clearly the signs of juvenile homosexuality._ It is proper to hold that the neurotics show themselves functionally bisexual. Among the neurotics the males often have little or no beard growth, plump and roundish bodily figure, high voice and soft facial features, especially nose and lips; they have small hands, small feet, their penis is remarkably small, scant hairy growth upon their mons veneris, cryptorchism (undescended testicle), hernias. On the other hand neurotic women show hairy growth on face, flat chest, strong, male figure—more angular than is characteristic of women,—large, full hands, large feet, disorders of menstruation including amenorrhea (complete suppression), infantile uterus, male larynx and deep voice. I do not maintain that this is invariably the case. Now and then I have met with exceptions; but I believe that a thorough investigation would support this contention. The tendency to neurosis is due to the strong instinctive cravings which manifest themselves bisexually.