Spasmo

Spasmo is a 1974 Italian horror giallo film directed by Umberto Lenzi.

A young couple on their nightly hormonal romp decide to go to the beach, where they first meet a mysterious man who is parked there. After asking for a light, the couple make their way to some nearby ruins, where in the midst of their passion they discover a hanging woman. Upon investigation, it turns out to be a brutalized mannequin. The mysterious man peels off in his car before they can ask him questions.