i'm straight and have an exclusive diaper paraphilia. i've found myself cumming to the guy in diaper sex videos at times, so i've tried to sample some gay/male content.
it's been a mixed bag. the times i find myself getting off to it, seem to be way more about seeing big thick huge soaked pampers than anything to do with who is wearing them. the times i find myself turned off by it, seem to be because i'm just not sexually attracted to men. or, i guess i could say, i am significantly less sexually attracted to men than i am to women, even though there are men in diapers i would prefer to see over women in vanilla contexts.
there are times i really do wish i enjoyed men in diapers more, or messing, because there are huge swaths of content in an already niche/bizarre space that i just am not wired to enjoy.
i think to enjoy guys in diapers, they have to be in shape, no body hair, display an actual interest in the fetish, not talk (or at least not have a really annoying voice), and of course be wearing a diaper that fits well/is thick enough. but i could say all of that about women in diapers, and it'd still be true. so i don't really know.
my understanding of why normie straight men will watch porn where guys fuck women and not solely lesbian scenes is because they like watching penetrative fucking occur and aren't attracted to the guy so much as "the act of sex". i guess that parallels my diaper fetish version. or maybe i'm just porn sick and it's warping my sexuality.
either way, absolutely zero percent chance i would ever do anything with a man IRL, regardless of diapers.