answer:lol…. My butt doesn’t hurt, Snekles. I’m not that kind of homosexual! ;) Wow… That was bad… Anyways… I’m really not sure, but hold on… I’ll see if I can find some background for us! Hmm… Shamelessly stealing someone else’s answer from Quora. “closet (n.) late 14c., from Old French closet ‘small enclosure, private room,’ diminutive of clos ‘enclosure,’ from Latin clausum ‘closed space, enclosure, confinement,‘from neuter past participle of claudere ‘to shut’ (see close (v.)). In Matt. vi:6 it renders Latin cubiculum ‘bedchamber, bedroom,’ Greek tamieion ‘chamber, inner chamber, secret room;’ thus originally in English ‘a private room for study or prayer.’ Modern sense of ‘small side-room for storage’ is first recorded 1610s. The adjective is from 1680s, ‘private, secluded;’ meaning ‘secret, unknown’ recorded from 1952, first of alcoholism, but by 1970s used principally of homosexuality; the phrase come out of the closet ‘admit something openly’ first recorded 1963, and lent new meanings to the word out. This something I found on etymology online, a great source. I suspect the phrase is also related to the other saying about skeletons in the closet.”