To be honest, I had a couple of strict dating rules, too. My rules were that my partner had to be (a) biologically female and (b) of the same species as me. I didn't really care as much if she LOOKED like a horse as long as it was a good ride. But back then, working on Bourbon Street as I did, I got propositioned more than once by someone whose voice was deeper than mine - and I'm mid-baritone. It was worse for our trumpet player, because he had "educated lips." But the thing is, back then there was this understanding, and I'm told that this hasn't changed. If you told someone that you didn't "go that way" then they would shrug, say "your loss," and continue prowling for the evening.
I didn't have a racial hang-up, and in fact there was a beautiful black woman with classic Ethiopian features in our mechanical drawing department at my first job. She was engaged, but if she had not been engaged at the time, I might have made a play.
Some of the temple "virgins" from ancient Egypt, Rome, and Greece were trans wannabes. Didn't have such good surgery back then, but they had plenty of makeup. In fact, ancient Greece didn't consider homosexuality as sinful. There were some serious negatives about general sexual violence in that time period, but it was not unusual to see a same-sex union.
historyofyesterday.com