Leos Leiden (1976)

A slim brunette with long brown hair is sitting by the window in what looks like a quiet apartment, daylight hitting her face before things move inside. She ends up on a couch in a dimly lit living room, riding a dark-haired guy in his 20s, both of them completely naked and grinding slow at first. He flips her over and takes her from behind, slamming hard while grabbing her hips — you can see the couch shaking slightly. Later, another guy shows up, also dark-haired and slim, joining them on the bed in a close-up shot where they’re all tangled up, one of the girls giving a deep-throated blowjob while getting fingered. The lighting stays low throughout, mostly lamp and natural light, giving it that raw, unpolished feel. Camera stays tight during the oral and doggy scenes, no shaky amateur stuff — whoever shot this knew where to focus.