Possession (1981)

Starts outside with this slim brunette in a backpack running around a cobblestone courtyard while a lean guy with short brown hair chases her. No clothes off yet, just flirty back-and-forth near parked cars. Scene shifts to a dim hallway where she’s facing away from the camera in a light jacket, him standing close behind her in the doorway. Close-up of her face shows her biting her lip, eyes half-closed—looks like she’s already into it before anything even starts. Later there’s a random kid in a white coat playing nearby, but that’s just a quick shot and they keep it PG there. Camera stays tight on the doorway action, low angle makes it feel like you’re right there in the hallway with them.