La dentellière (1977)

The redhead girl has thick shoulder-length red hair and a slim body, seen first walking barefoot on the beach in daylight with a guy who’s also slim, early 20s, short brown hair. They sit at an outdoor table later, drinking from bottles, laughing, no shirts touched yet but clear tension. Then it cuts to her lying in bed, top off, legs open, waiting as he enters her from the side in a slow missionary position — you see her hand gripping the pillow. He stands in front of the bathroom mirror jerking off, strokes firm and fast, camera tight on his hand and dick. She’s sitting on a couch in dim light glass in hand, then back in bed riding him reverse cowgirl, bouncing steady. The lighting shifts from natural outdoor to dim indoor, giving the sex scenes a more private feel. No loud talk, just breathing and the occasional moan.