This is by FAR the best R-Rated gang bang scene I've ever seen. It is the last scene from the movie "Last Exit To Brooklyn". FYI: The movie it self is also not to bad and well worth watching in it's entirety.
As the hot brunette chick was sound asleep the guy started penetrating her cunt with a sex toy while jerking off. It did not take him long to cover her body in semen.