Ok, this has been bugging me for years, so it’s been out a while. I believe, but am not positive, that it’s set in the 70s, clubbing/drug use type movie. The scene is this, two couples (just met) getting hot and heavy together, one girl decides to back out as the other couple starts to have sex. The other girl says something about taking care of them both. The girl backing out leaves, then the guy she left hanging scoots up behind the girl that stayed, and they are all on their side in a threesome. The girl is now not enjoying being double teamed, but doesn’t really do anything about it. After a minute the girl that left comes back and gets her friend, rescuing her from the situation.

I was thinking like “boogie nights” or “54”, even “summer of sam “ but unless there is an unrated version I’m at a loss. Any help is appreciated!