I have only watched a little of it, but think about those mega bukkakes and how much skin was involved, that is what you have here. Here is what IMDB says in the guide for parents in the sex & nudity section:

Opening scene is a room full of men in their underwear touching themselves through and under their garment.
Men chant "bukkake buys" as they enter a room with a nude woman kneeling on a tarp showing frontal nudity. The men then proceed to masturbate and ejaculate on her face and body. The camera limits itself to the faces of the men, and show the hand movements with some pubic areas visible. The woman is seen several times covered in semen as the men convulse in orgasm.


There is a thread about the Mope movie and I shouldn't have derailed this one discussing the movie that Faceblaster brought to our attention.