While Thistlewood and other overseers and white employees chose their sexual victims from slave women, many white enslavers in Jamaica kept mulatto "free coloured" women as mistresses, such as Dorrill and his mistress Elizabeth Anderson. But even white enslavers with a white wife and a mulatto mistress often raped their slaves. Cope and Thistlewood even raped slave women who had regular male slave partners. In 1754, Dorrill hired William Crookshanks to assist Thistlewood, and he immediately raped a slave named Bess. Within three months he was complaining of having contracted "the clap". In 1757, another white employee, Thomas Fewkes, caught the same disease from a slave named Little Lydde, who was raped by Thistlewood.