Has he actually said or shown that when he's looking at, touching, or doing whatever to your butt, he's hoping for anal sex? Because the two things aren't necessarily related.
Are there men who don't like to do anal? There must be . . . but not necessarily very many. I would guess that most men enjoy it, with a much smaller number to whom it is really, really important and a tiny number who genuinely have trouble relating any other way. I doubt he's in the tiny group, but I guess you won't know unless you ask.
