Mmmm, I HIGHLY recommend it. There ain't nothin' like a good rimming when I'm fresh out of the shower and all clean back there (I make sure to soap up very well, in anticipation of the fact). It REALLY turns me on, gets me wet like crazy, esp. in combination with clitoral stimulation. Anal tongue-fucking is wonderfully gentle but SO hot. My bf loves it and will go at it for long periods of time (he's wonderful).
There isn't the same pressure/need to relax/need for lube as there is with other anal play, either, because the tongue lubricates itself and will keep the area moist. If you're uncomfortable at all with getting that close to someone's anus, even after cleaning, just get some dental dams at your local sex shop (or online) and give it a try that way. Believe me, you won't regret trying it! It took us (mostly me) a while to warm up to the idea, but once I was ready, both of us really got into it.
**Man, now I REALLY can't wait to see him this weekend!!
**