From the transcript of the episode "Sam Again"

Except he took Jess's raisins out of her purse and got sick last season - don't you remember? Infected with kid germs? Poppycock palace? Dude loves raisins.

Two words: veal face

Yeah, and don't even get me started on sex. I mean it's weird, and it's gross and it's way too close to where we poop and pee, which is why I'm never gonna do it.