The scene of the lord going off to crusade while locking his lady into a chastity belt was a staple of romantic literature, although the reality was that the belts were never intended to be worn for extended periods, at most being worn as a barrier against rape.
There were two forms of the belt - the 'partial pudenda' which surrounded only the vagina with outwardly pointing teeth (sometimes spring-loaded), and the 'full pudenda' (the one pictured), which prevented both front and rear entry.