Look. If you are cat tonguing chocolate crisps out of crust canyon YOU ARE DOING IT WRONG. High fiber and a thorough shower before sex should be top priority regardless of if you eat ass or not. If you do that then you are already set. There should be no poop taste or smell and the fact that you think there would be just shows you or your partners need to step their game up.
I’m a heady germophobe. I don’t allow outside pants in the bed. Absolutely no shoes in my house (monsters.) Wash my hands every time I get back home (how dirty is this steering wheel?)