Sex and Capacity: The Management of Monsters?

The first consideration by a civil court of the test of capacity to engage in sexual relations – X City Council v MB, NB and MAB – is as recent as 2005. This article places this and subsequent cases in the historical context of the way in which the law has constructed the sexuality of persons with intellectual impairment. The article argues that, beginning with a series of rape cases in the mid to late nineteenth century, which recognised the concept of consent given through the expression of animal instincts, the law has accepted and deployed a model of intellectual impairment which understands expressions of sexuality in terms of an increasingly unstable opposition between vulnerability and danger, understood as the presence or absence of instinct, and as indicating an underlying ‘monstrosity’. The article argues that the historical continuity apparent in the modern case law is unfortunate and should be rectified.