A bunch of "mopes" jerk off on the skull of a laboratory human skeleton model. The skeleton's jaw is articulated and is operated off camera by a female voice actress who is never seen. The voice actress says all the kinds of things pornography girls in bukkakes say (Examples: "Oh yeah, baby, I want every drop of that hot load all over my pretty face", "Come on, guys, I need more cum!", etc.) and as she says them she causes the skeleton's mouth to open and close in synch with her words.