I don't like to see anus in porn. Sure, there's the grossness of a poop-chute, but it also looks... weird. Like a blemish or a puncture wound. Sometimes it looks like it's trying to distract me from the balls, with its vividness(especially in black fur). I like balls, dicks and boobs, but if that bright pink poo-passage is visible, I'm less likely to fav it. I know there are tons of people who are into it and lots of other kinks I find gross, but, ergh. If I ever have gay sex, I think the only act I'd be able to stomach is a blow job. Unfortunately, nearly all the gay porn I find on FA is rump-bumping. Lots of it even shows a closeup. Never do I see any shit on the dicks, though. Never! I highly doubt real buttsex has anywhere NEAR that rate of cleanliness.
Still, I do have fantasies where I fuck my fursona in da butt, because it would still feel good, and imaginary raccoons leave no chocolate coating. Unless you're into that sort of thing.

*goes back to your trashcan to forage for chocolate*