Er... I am all for a bit of relaxation now. If a man and a woman agree on anal sex because both of them like it and no one acts under coercion, than no court in the world can make a case against it. It is all a matter of preference, size, the way orgasm is on the horizon, and so on. If a man is very well hung, so to speak, I think the girl, if she has a very sensitive anus, won't appreciate it at all. But if the willy is average or small (which is no negative thing at all, despite laddish culture etc.), and the girl's rear end allows for it, it can be absolutely thrilling. Remember, doing it the 'right way' can be painful too if the vagina is sensitive, dry, and tight, and the penis is XXL.
Don't let this turn into a religious sermon about what is right and what is wrong. I hate that.
Listen to Hotsie at this point.
It is not down on any map. True places never are.