For me, I can find a man very hot regardless of the sexual orientation, but what brings it to the next level is if he reciprocates the interest, sends me signals and so on.
So I find gay men much hotter than straight men, on average. They also like to present in a way that turns me on, e.g. with tight pants, nice underwear and so on.
An exception to this is all the "bro" or changing room behaviour of many straight guys. Humping or a pat on the ass registers in my brain as a sex cue, and yeah that turns me on. But then I remember that they are straight, so even in an alternative reality where I would get to fuck them... They would never be able to handle my dick as I wish, and preparing for anal in the right way, like a gay man would.
(Replace "gay" with "bi" and everything remains just as valid)