‘Congenital phimosis’ was one of a number of pseudo-pathologies that entered mainstream medicine in the nineteenth century. In the twentieth century Truby King, Henry Jellett, and Eric Corkill advocated premature foreskin retraction as the first intervention to manage ‘congenital phimosis’. If that failed they recommended circumcision, although eventually it became more expedient to use circumcision exclusively. The nineteenth-century justification for such interventions was to prevent masturbation, but by the middle of the twentieth century this was replaced by prevention of infections.