So let me continue my brief account of infantile sexuality. I could supplement what I have told you concerning two of the bodily systems by extending the same scrutiny to the others. The sexual life of the child consists entirely in the activities of a series of component-instincts which seek for gratification independently of one another, some in his own body and others already in an external object. Among the organs of these bodily systems the genitalia rapidly take the first place; there are people in whom pleasurable gratification in their own genital organ, without the aid of any other genital organ or object, is continued without interruption from the onanism habitual in the suckling period of infancy to the onanism of necessity occurring in the years of puberty, and then maintained indefinitely beyond that. Incidentally, the subject of onanism is not so easily exhausted; it contains material for consideration from various angles. In spite of my wish to limit the extent of this discussion I must still say something about sexual curiosity in children. It is too characteristic of childish sexuality and too important for the symptom-formation of the neuroses to be omitted. Infantile sexual curiosity begins very early, sometimes before the third year. It is not connected with the difference between the sexes, which is nothing to children, since they—boys, at least—ascribe the same male genital organ to both sexes. If then a boy discovers the vagina in a little sister or play-mate he at once tries to deny the evidence of his senses; for he cannot conceive of a human being like himself without his most important attribute. Later, he is horrified at the possibilities it reveals to him; the influence of previous threats occasioned by too great a preoccupation with his own little member now begins to be felt. He comes under the dominion of the castration complex, which will play such a large part in the formation of his character if he remains healthy, and of his neurosis if he falls ill, and of his resistances if he comes under analytic treatment. Of little girls we know that they feel themselves heavily handicapped by the absence of a large visible penis and envy the boy’s possession of it; from this source primarily springs the wish to be a man which is resumed again later in the neurosis, owing to some mal-adjustment to a female development. The clitoris in the girl, moreover, is in every way equivalent during childhood to the penis; it is a region of especial excitability in which auto-erotic satisfaction is achieved. In the transition to womanhood very much depends upon the early and complete relegation of this sensitivity from the clitoris over to the vaginal orifice. In those women who are sexually anæsthetic, as it is called, the clitoris has stubbornly retained this sensitivity.