Now that there exists in psychoanalysis a logic that can identify the phase of the formation of a subject, like that of a neurosis, we can confirm that adolescence is a decisive logical phase. A time of the retroactive hold of fantasy, it is also the time of the discovery of orgasm, which constitutes what J. Lacan calls a maturation of the object a. The sexual relation discovers its non-conjunction in the man and the woman, whose effect is one of castration for both partners, repeating the symbolic castration that is the outcome of the Œdipus complex.