This chapter charts the processes by which deceptive sex came to be regarded as potentially constituting rape. Through tracing these developments, the chapter shows how doctrinal features of the law, such as the way consent and deception are thought to be related and the modes of deception punished by law, were important to this process. Yet the chapter also argues that to fully appreciate how and why the changes occurred, it is necessary to pay attention to the array of interests the law has sought to protect and how these have shaped the range of topics of deception that might ground a charge of rape. This argument leads to the conclusion that, in the context of deceptive sex, deception has not been considered wrongful because it invalidates or precludes consent, as is commonly thought; rather, deception has invalidated or precluded consent because it has sometimes been considered wrongful. The chapter ends by introducing some reasons why this insight is important to ongoing debates regarding the criminalisation of deceptive sex.