Some guys like to penetrate, some others like to be penetrated. Some are vers (versatile) and like both but may have a preference.
If you're vers, there's no rule. You can be top and bottom during the same sex session if your partner is vers. Or just be either top or bottom for this session. If your partner is exclusively top or bottom, you can adapt to the situation.
About orgasms. You can have a prostatic stimulation, but the main point is that the anus is a very innervated area, so you can have pleasure just by stimulating it (e.g. annulingus). There's also a form of intellectual pleasure, and the joy to give pleasure to your partner.
And you don't have to get an orgasm each time you have sex. And if you stll want an orgasm, your partner can finish you off with a handjob/blowjob when he's done.
Imagine a world where straight sex would be exclusively oral sex. You could like getting and/or giving oral sex, or both (top, bottom, vers). You could have pleasure just giving oral sex, without always focusing on your orgasm.
Does the guy getting fucked in the ass always maintain that role? Or do the partners sometimes switch off? How does the guy getting ass fucked get satisfied with an orgasim ?
OP's exploring unfamiliar territory and doesn't have clinical/conversational vocabulary for it yet, which isn't too surprising considering growing services like Lemmy are bound to attract all kinds of people eventually. We shouldn't gatekeep info because of crude language, and as a bi guy I don't think they said anything explicitly hateful here.
Interesting how anyone could consider a simple question about sexual activity hateful. And even more interesting that the "offended" person would comment on it.
How does the guy getting ass fucked get satisfied with an orgasim
Have you heard of the prostate?
If you jack it while you're getting fucked, the extra stimulation leads to a massively hard orgasm, too. Also I don't know if this is a thing for a lot of guys, but if I'm fucked just right, I get this full-body orgasm that is just insane.
As a top, I love feeling a bottom's muscles tighten from the inside as he approaches and reaches orgasm. The way his prostate hardens and pushes against my penis is often enough to send me over the edge, too.
I like to get fucked for hours on end. I don't have to cum and would prefer the tops to keep their hands away from my dick. The sensation of getting fucked is sufficient gratification for me. I could cum from that alone, but would try to hold that off as long as possible.