Casa d’appuntamento (1972)
This one’s all about the buildup. A young blonde girl in her 20s adjusts her clothing in what looks like a bedroom, then interacts with something in the bathroom. The lighting is harsh, and the camera zooms in on her hand. Meanwhile, two mature guys in their 30s talk in an office and a bar. One’s got short, neat hair, the other’s balding with grey streaks. No sex yet, but the tension’s there. Sharp cinematography with close-ups and medium shots.