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In the scene with Alexis Fire she grabs his dick and says "I like to pull the skin back" There's also another quick mention later on in the scene but I can't remember what it actually was.
Just a heads up, you guys should watch the start of every Dave Cummingsscenes because I've seen a bunch of times when he tells the girl to pull the skin back. I've heard a few times where he said, "On old guys you gotta pull the skin back"