Okay - I heard this one at a party last weekend and I am seriously freaked out.
A gentlemen (I use the term loosely) was describing in detail how he loves to have his partner take liberal amounts of laxatives shortly before a sexual encounter takes place. Apparently, he and his beau then fool around until the stomach rumblings start, at which point he gets the laxitive-taker atop him and begins plowing him in the ass until his beau begins to fart and then has forceful, explosive diarrhea all over his cock. The gentleman telling the story went on to describe how he enjoyed having his partner continue to ride his cock even as the shit was being passed, at which point it became regarded as 'lube' for the duration of the encounter.
What in the fuck sort of fetish IS this? Sounds like the most extreme case of scat play I've ever heard.