Countess Dracula (1971)

This one’s all about the atmosphere. A slim blonde teen with long hair gets it on in what looks like a castle or dungeon. The setting is moody, with dim lighting and period costumes. She and her partner spend a lot of time close, embracing and about to kiss. The camera stays tight, giving you a good look at their faces and reactions. There’s no rushed action here — it’s all slow and deliberate, with plenty of standing and face-to-face moments. The bearded older guy watching from the side adds a voyeuristic twist.