The early stages of development as well as complex mother-child interactions are often implicated in the origins and evolution of eating disorders. Without overlooking these elements, the psychosexual dimension inherent to these symptoms needs to be taken into account, if only because of their favoured period of onset (adolescence) and the prevalence of this symptomatology among women. Numerous studies have highlighted the underlying psychopathological organizations essentially illustrating borderline functioning. Borderline functioning is characterized by defence mechanisms such as splitting, projection and denial, and draws on major dependence on the environment. However, other paths have been developed, highlighting a partial and perverted relationship: some joint mechanisms of defence but also sexual issues, showing the significance of narcissism, the denial of castration and the splitting of the actual ego. Masked depressive elements (often with a melancholic valence) and sadistic and masochistic attachments that can be identified through an active and passive game of position reinforce dependence. Based on projective data, our study specifically focuses on - the relationship between the singular modalities of processing object loss and the use of perverse adjustments mobilized in the deviations of eating disorders and their overinvestment - the particularity of identifications in view of bisexuality and gender differences - the characteristics of relational movements mobilized through confrontation to sexuality.