Straight cis male here, and I've never even considered doing anything with a guy.

I'm also not homophobic, which I only mention because a lot of people lie to themselves about that, but really it wouldn't bother me if I was gay/bi/whatever.
For more context, outside of sexuality, I would say I'm generally more "feminine" than most men.

I've thought about it in a "logical" sense, like, wondering if I only like women because of society or if it's an innate thing, but whatever it is, I just have no sexual interest at all in men.