In real life, outside the porno industry, there is a thing called "Santorum" which is named after a senator. Anyhoo, it is the discharge of, well, it is frothy, and it comes out when the guy pulls out.
Now in the porno industry they prep. Usually they limit their eating to soups and jello, food like that, and also they probably do anal quite a bit to where they are clean anyways from all the "cleaning" out they partake in.
By the way, yeah, Max Hardcore, Hedonis.. good one haha