Spasmo

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

Enter couple number two, Christian and girlfriend number 1, who also decide the beach is a good place for a little afternoon delight. They too come upon a womans body, this time face down, just above the surf. However, upon investigating this one, it turns out she is a real person, who is in fact not dead. Introducing herself as Barbara and not really explaining how she got there, she quickly disappears as Christian is distracted. Despite seemingly being involved with the girl hes there with, Christian cant seem to get Barbara out of his mind. He finds a flask with the word, Tiancin on it, ever the resourceful one, he tracks it to a boat with the same name, harbored in a local marina. He and his soon to be exgirlfriend join a party aboard the boat and meet Barbara and her current lover Torres.After pissing off Torres by swooping in on his girl and abandoning his own girl, Christian leaves with Barbara and they wind up back at her motel after a drive through a wooded area where we see even more mannequins hanging, this time adorned in lingerie. Some backstory is revealed in which Christian relates of a terrible incident with his father when he was younger and Barbara says that Torres is not her boyfriend but more of a provider. After some flirtation, Barbara makes an odd request before Christian can close the deal, he must shave his beard. Ever the ladies man, Christian willingly, but slowly complies while Barbara does the usual womanly presexual rituals. As Christian takes his sweet time shaving in the bathroom, he hears a noise outside, as he pokes his head out the open window, hes assaulted by a man with a gun. After being downed, the manTatum, enters the bathroom, and proceeds to threaten Christian. Not one to take that lying down, Christian gets up and a brief struggle ensues wherein Tatum is shot and killed. Understandably freaked out, Christian leaves the bathroom and tells Barbara everything. Strangely at ease with the concept of a dead man in her room, she

Source: Wikipedia