Haha, awesome thread! And for the record, I am all over that shit...wait...let me rephrase that!
Seriously though, I love it. What can I say, I have a bit of an ass fetish! Bigger the better too, then you can really bury your whole face in there. This will come as no big surprise to those who've seen my posts on the Ass thread and BBW thread in the Pics forum.
Gotts be clean though, soaping it up beforehand is half the fun. On the other hand, I've been married 19 years and have only tried this with my wife. With my wife, there's not a thing about her I don't find sexy, so it's fun. Not sure how that would go with anyone else.