I've done it with almost half of my (40 or so) girlfriends. It's like... naughty... and fun. It's kind of a control thing, I think. The symbolism of it is very exciting if that's what you're into (i.e., realizing you're down there with your mouth is as exciting as being down there with your mouth). Yep, cleanliness is paramount--lots of potentially gnarly germs down there (take my word for it, my GF is an NP, and she knows). I've always had my partner use an enema first, followed by a shower and soap and water rinse to get anything out that the enema might have missed. Basically, you want it so clean that you can eat off it (because that's what you're going to be doing). Also--wait an hour or two after the enema before engaging in anilingus, because enemas can have delayed effects. It doesn't so much have a taste like the vulva/vagina does. You'll just experience the sort of musky, forest-like, temperate climate which is very primal and raw (a.k..a., exciting). If it tastes like anything other than moist skin, you haven't cleaned carefully enough. Eventually, plunging the tongue deep inside after teasing for a bit can be fun. I also plunge in with my nose. *You can bring a woman to intense orgasm by stimulating her G-spot through her rectum. Be gentle, though, and do it with your lubed finger.