A brilliant and original reimagining of sexuality, this book examines how concepts lend themselves to power/knowledge formations, and offers a robust synthesis of insights from Foucault and Deleuze to extend those into a proposal for a conceptual next step for imagining the structures of sexuality as eros. Many contemporary French philosophers make incidental use of the notion of a ruse. Its names are legion: 'duplicity, ' 'concealment, ' 'forgetting, ' and 'subterfuge, ' among others. This book employs Gilles Deleuze's philosophy of the concept to describe three specifically conceptual ruses, or sleights, that make up part of the conceptual support for the concept of sex. These are the sleights associated with the concepts of norm, bisexuality and development. Mary Beth Mader argues that concepts can trick us, and shows how they can effect conceptual sleights, or what she calls sleights of reason.