Les amours singulieres (1977)

The brunette’s curly hair stays wild the whole time — she’s on the boat first, wrapped around a muscular dude with short brown hair. They’re making out hard, shirts off, hands all over each other, rocking side to side like they’re about to fall into the lake. Cut to the shower scene, both girls together now, slick bodies pressed, kissing deep while one jerks the guy off between them. He’s thick-armed, tan, looks like he actually works on bikes for real — you see him earlier wrenching on a motorcycle in a driveway, shirtless, focused. The blonde’s smaller, slim but with a round ass that stands out in the close-ups, especially when she bends over in the doorway, getting eaten out from behind. Most of the action shifts between outdoor natural light and tight indoor shots, keeping things raw and unstaged.