Though being a  » young homosexual  » does not mean a specific risk of being contaminated by Aids, it may be studied as a priviledged figure of the psychological stakes liable to guide an adequate prevention, notably as regards the reference to the Oedipian father. Gabriel’s discourse, coming from a research dealing with the unconscious dimension of prevention, enables to stress a problematic  » angelism  » that may be considered as a real risk factor and questions reversely the present politics of prevention as well as the position of the psychologist in front of a youth on the register of his sexuality.