The same process took place, such that now, we can’t use the word “gay” without it meaning “homosexual”, when originally it simply meant “merry”. Same goes for “intercourse”. These were used as polite terms for homosexual and “doin’ it”, respectively, but now it’s about all they mean– the terms have been co-opted.

So; really, “butt” is a perfectly decent word, and should be taught as such. Internally, I cringe just a teeny little bit when I see a cock. Since my son in an avid bird hunter, I use the term correctly; “Oh, look! There go two pheasant hens and two nice, big, beautiful cocks! Man, I bet those’d be good eatin’”

When here among the literate, there is no need to be niggardly with your vocabulary.