Butterflies (1975)

The bathroom scene is the standout here. Two white girls, one blonde with short hair, the other brunette with long hair, both slim and shaved. They’re really into finger fucking and eating each other out. The camera gets nice and close when one spreads the other’s lips to get deep with her tongue. Before that, there’s a quick outdoor shot of a blonde kneeling naked in the woods while a clothed guy watches. Another girl sits on a couch holding her big tits, and a guy smiles with a glass of wine, but these are just teases. The main event is the girl-on-girl action in the bathroom.