Noun
A belt-like garment, designed to be worn over the genitals and locked to prevent sexual intercourse, typically for long periods of time, to maintain chastity, prevent masturbation, or to enforce BDSM submission.
(Can we verify this sense?) (figuratively) For a woman, refusal to have sex.
Source: en.wiktionary.orgSomeone told me the delightful story of the crusader who put a chastity belt on his wife and gave the key to his best friend for safekeeping, in case of his death. He had ridden only a few miles away when his friend, riding hard, caught up with him, saying 'You gave me the wrong key' Anaïs Nin