Genitalization is the last step of sexual development described by Freud. Its occurrence at puberty gives sexual difference its definitive form. Simultaneously, it affects the preceding phases retroactively to transform them. The limits between different steps appear less in their chronological sequence than as a work of reformulating after the fact, which suggests a re-evaluation of the theory, in particular of the phallic-genital articulation. Some hypotheses are formulated regarding the originary and the primitive, of the castration complex and the negative at puberty.