Zeta One (1969)

The blonde has long straight hair, a slim build, and a visible tattoo on her arm. She’s wearing a ring on her left hand, which shows up clearly in the bed scenes. They start out lying together under blue sheets, fully clothed, but by frame five she’s completely nude and crouched near the couch while he stands looking down. In the bedroom shots, she’s on top riding him slow, then stands over him while he jerks off. The lighting is soft indoors, mostly artificial, with medium and close-up angles that focus on her body and their positioning. The brunette guy is slim with short hair, not overly muscular but toned, and he stays mostly passive during the oral and riding parts. Some scenes take place in what looks like a living room with a green carpet, chairs, and a lamp, where she’s crouched naked facing the camera while he stands over her. No faces are blurred, so you get clear shots of their expressions during the action.