Hey, some people get off putting edibles in their butt. There are ways to get fuckin *weird* and keep everything reasonably sanitary.
Of course we're all walking sacks of blood, gore, bile, bacteria, pus, shit, mucus, fat, ect. wrapped up in skin. The revulsion we feel for those things despite literally being a walking pile of them is largely just an instinctual safety feature to keep us from rolling around in something and getting sick. But you can figure ways to make it relatively safe, I mean every shit fetish person would be dead already otherwise.