Yes. Absolutely. You could pick up several things, though HIV would be uncommon. I think the malady they worry about the most is a bacterial intestinal infection called giardiasis. People can even get it from filling up a cup from a beautiful rushing river while camping in the Rockies or the Sierras, but that's because of microscopic amounts of animal excrement that came from somewhere upstream.* So, giardiasis is transmitted both sexually and non sexually. If anyone else knows other specific STIs, they should chime in. *like they say in the world of work: "Shit flows downward."
I love Scarleteen... ORAL SEX - ANALINGUS Stimulating the anus or rectum with the lips and/or tongue. Level of STI risk: High risk Infections at possible risk of: Yeast/thrush (from trace fecal bacteria in mouth), chancroid, chlamydia, cytomegalovirus (CMV), gonorrhea, HIV (rare), HSV type 1 and/or type 2, HPV, genital warts, nongonococcal urethritis (NGU), syphilis, HAV, HCV Level of pregnancy risk: No risk
Use a dental dam. This keeps your tongue away from the germs, but he gets the same amount of pleasure. This is something I'd never, ever, EVER go for, but if you're into it, go for it.
Do I also get the same pleasure? (Getting to lick and suck on a butt is a pleasure for me). I don't get how I'm supposed to put that on. Are there any other ways of lowering the risk?
I had no clue that's what a dental dam looked like. I thought people just used heavy Saran wrap or something. Interesting that the list is that long and that it is considered high risk. Not my cup of tea, but whatever floats your boat ... Since we're not supposed to give out medical advice, the best thing to do would be to look it up. You'll get many hits on a search engine.
Imho scarleteen tends to overreact, I mean they list TALKING as a sexual activity with very low risk. In my experience analingus poses the same risk as other types oral sex in general. Don't worry about it too much, just pick the right person you trust and all should be fine.