One thing is certain, passion can get the best of anyone. I haven't rimmed a lot of guys in life to be any kind of measure. Maybe 4 at most. The first time was with a really, really cute Swede with blonde eyebrows and the reddest, softest lips. Passion got the best of me -I was in my 20s at the time and I flipped his ass up in the air and gave him a not fully invested rim job. I had no idea when he last showered but I assumed it was near enough to our play since he knew I was coming over. Loved. Every. Moment. Loved it. Loved it. Loved it. Had I known it was going to be the last time I ate his butt I would -or knew what I knew later, that it wasn't going to be a medical issue that time, I would have rimmed him like fire burning through a forest desperate for a drop of water. Beautiful little guy.
While the intentional rim jobs I've had cost me nothing, I have been burned by ass play where the guy may have 'seemed' clean but wasn't. Hand touches butt. Hand touches something else. Mouth touches the 'something else', and it might have well been ass to mouth. I was down for the count 3 times from this sort of contact. Twice it happened with a stripper at a bar. Tip. Fondle. Pick up coke. Drink. -Sick.
Bottom line, I haven't rimmed anyone again without knowing if the shower action is recent. I know I would not let another guy rim me unless I was absolutely sure I was clean, which means verrrrry recently out of the shower. If I like you, I'm going to have your best interest at heart. Heck, even if I don't like you I'm going to have your best interest at heart. I just wish every guy thought along those lines.
(Apologies for trips down memory lane... Some sexual experiences stick. Hard.)