“Uh, with me it is.”
Throw in some emotional trauma, lack of morals, drugs and possibly a weak personality and you’d be surprised what can happen.
Or, that any man who was morally corrupted could get into pederasty (sex between an older man and a post-pubescent young man), assuming there were some way to induce the young man's participation, e.g. slavery, bribery, or force.
But none of this notion of there being a set homosexual "identity."