I am curious about various anal sex issues, and have done some research online regarding this topic. My main question is the relative safety of anal/oral contact, including riming and the much maligned ass-to-mouth. I understand that the anus and colon have lots of microbe activity, and thus carries a risk. But how much risk? Can it be reduced by sanitizing/enema or other activities? I'm not talking full-blown scat here.

Any info would be helpful.