Abstract : In France, professional, institutional and political actors are tending to present "public communication" as a neutral and objective State service, which serves general interest. Our approach of the subject is going beyond this normative definition by explaining that "public communication" remains a State communication above all, which is helping to manage social norms. In other terms, "public communication" is an instrument of "social management", which allows the State to interfere in privacy by acting on the norms. We chose the case of messages towards homosexual in the Government's AIDS campaign, as they highlighted relations between power and sexual norms. In fact, by analyzing the social context in a long time, "public communication" in AIDS prevention proved to be more related to the management by the Government of the homosexual issue than public health issue . Our work is presenting how "public communication" accompanied the construction of State legitimacy about homosexual issue.