So. About men's fingernails — it's not just HPV lurking under them! A study reported on today in the Daily Mail states that out of 100 men and women, harmful bacteria was hanging out on the nail clippings of nearly 1/4 of the men. (Only 15% of the women had the same.) Some of the most infectious traces — enterobacteriaceae — could cause diarrhea and vomiting. And that's just if the guy puts his fingers in someone's mouth. [DailyMail]