This article argues that in England over the course of the eighteenth and nineteenth centuries, the understanding of adultery as a tort was complicated by an accompanying discourse of what I will call "quasi-criminality." Specifically – while formally trivialized – adultery remained linked to a threat to English kingship. The tension between the weight of relevant monarchical history and the absence of contemporary criminal enforcement created a new cultural narrative about adultery which attempted, itself, to serve a penal function. Examining the development of this discourse alongside the relevant law illuminates the complex social process through which public and private wrongs become distinguished – or conflated.