i've tried it before and to be honest, my current girlfriend's pussy is tighter than this girl's asshole was.
I wouldn't mind trying it with my current girlfriend but the resistance i run into is 2 fold. 1) she has a BAS in Biology. Which means she knows what goes on up there on a microbilogical level and what little attraction may have been there for her is completely erased. 2) I had enough trouble fitting in her pussy. I think i might actually break her if i stuck it in the tighter one
It's a different sensation though and does reguire quite a bit of synthetic lube (which, depending on the girl, can make it that much messier)
Porn stars who do alot of anal scenes go on a clear liquid diet for about 48 hours before they shoot their scenes just to avoid any kind of bloopers
But then again, there are some really sick freaks out there who don't care
I had a classmate in the Step program who tried anal on his ex-girlfriend once and ended up pulling out something extra (this was about 3 years prior to meeting him) and didn't try going there again until he had his apartment manager in the passenger seat of his truck. He decided to slip her the shocker and ended up with the same result. Suffice to say he spent that Sunday scrubbing the hell out of his passenger seat
I think there are alot of women who just kind of tolerate it to make their partners happy and a very small majority that can actually have an orgasm from it (this seems to be the majority who have forgoten what their pussies are for).
Now something i can't explain is the whole rimming thing
Especially the girls who like doing it to the guys. I mean, at least girls don't have much hair there....