Men's beards and fecal matter

[Bricg1970]

Or not cleaning properly after rimming can lead to infection as well

[Pyromancer]

I don't care what anyone says, I'm DEFINITELY skipping Bear Week in P-Town this summer...

[Pix]

I've always wondered if the toilets used in comparison for studies like this are the ones in the building of the lab which almost certainly get industrial strength (and potentially flesh dissolving) chemicals used to clean them on a daily basis.