If I remember the title correctly Behind the counter has a scene where Taylor St. Claire pulls off to do an ATM and leaves a bit of a mess. The stud stops her, wipes it off it off with his hand, then she gobbles it down.
Jewel De'Nyle shows how she keeps the set clean in the DVD Behind the Scenes footage of her scene with Rocco in Animal Trainer 15. She has a little anal leakage which she cleans by wiping it up with her hand then licking her hand clean. Quicker than asking for a towel I guess. Yum.
I don't know of any sources for such info; it's not my thing. But there's a site for every fetish..
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock