Bathing spreads syphilis
In the Middle Ages, Londoners frequented the bathhouses at Southwark, where they were attended by Flemish women in steaming hot tubs. The men among them were normally treated to more than a wash and a rubdown, so when syphilis arrived in England in 1500, it spread rapidly through the bathing community. In short, people who bathed fell ill. So Henry VIII shut down all the bathhouses in Southwark.