Michel Foucault's interest in the history of sexuality began as early as the 1960s, when he taught two courses on the subject. These lectures offer crucial insight into the development of Foucault's thought yet have remained unpublished until recently. This book presents Foucault's lectures on sexuality for the first time in English. These lectures offer a really important insight into Foucault's work in the 1960s on the question of sexuality-a topic on which his more famous works come from the 1970s and 1980s. This volume shows how he proposed a study of scientific knowledge about sexuality from biology to psychology, with some explicit engagement with figures who are only discussed obliquely elsewhere. Graham Burchell is the most important translator of Foucault's work into English, and Anglophone readers remain much in his debt.