This chapter examines the law of nullity of marriage to consider how deception has affected the existence or validity of consent. It articulates important differences between void and voidable marriages, arguing that these speak to the public and private sides of marriage, respectively. It also showcases the range of deceptions that have been considered legally significant, situating these within the cultural framework outlined in Chapter 1. On top of this, the chapter argues that the range of qualifying deceptions has often been justified with reference to public policy or convention on the basis that the relevant information would typically be important to an intimate partner or that its disclosure would serve a collective interest or value. The chapter concludes by suggesting that changes in the law of nullity, and a small number of related areas of law, demonstrate that there is still a desire for legal recognition of the wrongs and harms associated with inducing intimate relationships, even as these have shifted over time.