Finnn,
You are right to be concerned.
With people's pre-occupation and interest in anal sex recently, the risks and concerns seem to be swept aside.
The concern about transmitting bateria from anus to mouth or vagina is a very REAL concern. That's why condoms are recommended for use with ANY anal contact. Certainly, you should not move a finger or penis from anus to any other opening without the thorough scrubbing with soap and water to remove any chance of cross-contamination.
Usually, a routine bowel movement is enough to rid the rectum of any fecal material, but if it's been soft and a mess, perhaps you'll want to skip the anal for the night. At least that seems to be logical to me.
Finally, though some people speak freely about rimming or tounge action on the anus or rectum, I know of no one who does it. It would be essential to use a dental dam or condom for the same reasons outlined above. But frankly, I think this particular kick is vastly over-rated, and publicized solely by some very kinky porno flicks where the actors take huge risks.
In my book, that's too big a risk.
Hope this helped in some way.
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