Le miroir obscene (1975)

Starts with a slim brunette in a bob talking to two guys at a bar—one’s a tattooed muscle dude, the other’s just average. They move to a bedroom where a blonde with long wavy hair joins in. The tattooed guy goes down on the blonde first, slow and deep, while the brunette watches. Then it’s doggy style with the blonde, her tits bouncing every time he slams in. The other guy gets his turn with the brunette, riding reverse cowgirl so you see her ass flex. Both girls are tight, wet, and take it like pros. Lighting’s dim but you still get a clear shot of everything—no weird angles or cutaways.