I’m “totally straight” in the sense that until I ran across the idea from other people it would no more have occurred to me that I could have sex with another male than it would have occurred to me that I could eat with my nose instead of my mouth. (I can find males cute and attractive, but it lacks a certain “hmm bring that over here, yummy”)
The way I learned of the existence of gay males and gay sex was by being angrily called names I did not understand, “fag” and “fruit” and “pansy” and stuff like that, and experiencing that all interwoven with threatened and real violence. I can distinctly remember thinking “It sounds more like what they want to do to me” and being outraged and resentful that they were somehow blaming me for this. Excuse me, I’m not doing a damn thing, you guys are coming at me and prodding and snapping and messing with me and my stuff. Trying to stick your dick in me would fit right in with the rest of it, and you accuse me of having a sexual thing for guys?
So because that’s how I got introduced to the concept, the way I felt about gay sex was all wound up with hate and violence and making people do disgusting things in order to humiliate them, so of course yecch!
I can’t say that I don’t have any residual carry-over from that, but mostly I don’t think I feel aversive about it these days.