While popular debate grapples with the legality of gay marriage, networks of medical, political, and juridical discourses produce and situate sexuality in a field of knowledge that is constantly under examination and administration. The rationalization of sexuality, and its dispersion into multiple fields of knowledge, has become part of a system of power relations that produces identities and manages them. Within this context, this paper places Horkheimer and Adorno's excursus on Sade's Juliette in conversation with Foucault's first volume of the (...) History of Sexuality. It explores how instrumental reason and power/knowledge relationships produce discourses of sexuality, which have come to dominate Western society. It also explores possible sites of resistance, through the notion of performativity, that exist within these modes of rationalization and power. I argue that this interlocution of Horkheimer and Adorno with Foucault helps us see sexuality as a site of both domination and resistance. It also shows how sexuality is produced in a field of contestation where possibilities of practices of freedom are always circumscribed by modes of rationalization and networks of power. (shrink)