it's one of my biggest fantasies, I think, to have my guy ask me to play with his asshole. he licks mine and we have anal, although not as often as we used to (not sure if it's because he doesn't want to or because he feel that I don't want him to..), and I would LOVE to return the favor if it's something he would be into. it's not something we've talked about, and I've been working my way little by little towards it everytime I give him head by playing with his perineum. I know I really should just ask him if it's something he might be open to, but honestly I'm a little shy.
Love it, both giving and receiving. Although I would say I like giving about 85% of the time, it really turns me on like crazy!