La disubbidienza (1981)

The girl in the sheer lace curtains is the first to stand out — early 20s, brunette, slim with small breasts, totally visible in warm close-up light. She’s on her knees near the bed, then bends over as a guy enters her from behind in slow, deep doggy style. Second couple is barely moving in the back — man and woman sitting on the edge of the bed, low light making it hard to see their faces, but they’re watching. Camera stays tight on the girl’s back and ass during penetration, lingering on the way she arches into each thrust. The dim setting keeps it shadowy, but the angles are well-framed, especially the side shot showing his hand gripping her hip. No loud dialogue, just quiet moans and steady rhythm. Feels like it’s happening in real time, no cuts between major moments.