Hating as an act requires the presence of the object: the author hypothesizes that hating one’s own sex may constitute a last resort level of organization in the face of major disorganizations of identity, thus preserving an object that vectorizes the drive at all costs and maintains an object-related psychic functioning. The subject’s sex can become the hated external object that Freud studied in Instincts and their Vicissitudes, a proposition that is highlighted by different clinical situations. Adolescence is a particularly propitious time for hating one’s own sex, a quintessential fixation point of the conflict between identification and identity. Self-mutilation and scarification behaviours are analysed in the light of this hatred of one’s sex and understood as mortifications linked to the problem of mourning. From this perspective of the reorganizing role of the act of hating, only hating and destroying can be clearly differentiated.