If hemroids are common and can openly bleed, and people poop with hemroids, how do people not get infected buttholes all the time?

That part of the body, like your mouth, has features that greatly reduce the chance of infection because they are the entry and exit points for foreign objects or waste. It is complicated how it all works, but in short your body really needs those parts to bot get infected, so it adapted ways to keep that from happening.

That was the explanation I got from the doc when mine first showed up.

Edit: All hail the rise of the butt bots!