Your rectum doesn't actually store your stool... it is stored a bit higher up the digestive tract. Therefore, unless you are having problems with constipation, there isn't really much of a risk of him encountering fecal material, just bacteria. Just a regular shower should be okay.
Anal sex is considered a high-risk sexual activity, so be sure he wears a condom and uses lots of water-based lubricant, and tell him to go slow. This will help prevent condom breakage AND make it less painful for you. Do NOT allow him to use the same condom if you switch over to vaginal sex, and if he has been touching your anus, do not let him touch your vagina or clitoris without washing thoroughly first. This is the way many (actually, the vast majority of) young women get urinary tract infections... unintended exposure to fecal bacteria.
As for whether or not people like it - it's pretty divided, so far as I can tell. Some people like it, some people don't, and others are neutral.
Last edited by vashti; 27-06-10 at 11:18 PM.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?