Nackt und begehrlich (1978)

Blonde girl with medium-length hair is on her knees sucking a guy with short dark hair in a bedroom. The lighting’s low, curtains drawn, close-up shots show her throat bulging as he fucks her mouth. Later, another blonde — thinner, shorter hair — takes over, same guy, same pace, rough but not brutal. They switch to the living room couch for doggy and missionary, her on bottom, legs up, then riding him with her back arched. Camera stays tight most of the time, no fancy cuts, feels personal. You see the guy’s muscular build and tattoo on his forearm during the grind. The second girl’s more passive, but she rides him near the end, grinding slow while sucking her fingers.