Why don't you guys try the next best thing, just use your fingers to gently rub the asshole...use some lube if you need to.I love it, my ex used to do it. Hubby has apprehensions about it. I guess i kind of do too. We are both incredibly OCD about germs. I've never done it to him. I've thought about it, but the picture of him telling me to get away from his asshole kinda draws me away from the idea i suppose.
Also, you can try it in the shower/bath or right after. And if you just let your saliva come out rather than licking in, then you won't ingest any germs really. It's best if there is no hair or it's trimmed back there too.