Directed by Charles Matton | Starring: Dayle Haddon, Udo Kier, François Dunoyer, Jocelyne Boisseau

The story is based around "spermulites", the alien inhabitants of a dying planet. The only way they can save their planet is by sucking the men of planet earth dry of sperm, kind of like horny vampires.

IMDb Spermula movie posters