Ok so I wondered if the collaborative mind of &ToTSE could come up with an explanation for this riddle. Every guy can sympathise here -
How the hell do pubes get on top of, or around urinals?
Seriously, whenever I go for a piss at a pub or wherever, there are always pubes on the otherwise pristine white pissing recepticles. I thought there must be a breed of pubic hair that ejects upon the sight of a urinal or whatever. or someone rips them out and places them there.