I think any of us who said no to the pee would also say no to the shit.
And speaking of that, you reminded me of when Dustin Diamond gained notoriety for issuing a cleveland steamer in a porno.
EDIT: Ooh, and here's another component to add to the original question, for those of you who answered yes (so far just you bj): Would you still let them pee on you if they were video recording it, knowing full well it could eventually land on tmz?