Here’s a museum-style picture of one of those historical chastity belts with which traveling men were once wont to encumber their wives:

chastity belt

Interestingly, although great and unsanitary lengths (note the viciously toothed slot) were taken to prevent the conception of unauthorized heirs, this device does not include the complete wrap-around iron strap with additional toothed opening at the rear, as was sometimes seen. Apparently the man buying this device was content to prevent good old vaginal sex; if he was concerned about any anal pleasure dalliances with the butler, he didn’t let it influence his purchasing decisions.