Mathilda May in 'Lifeforce' (1985)
Sci-fi vamps from outer spaaaace! Yes, it's an extremely cheesy, often cheap-looking horror thriller that features the likes of Patrick Stewart and Steve Railsbeck. But it also boasts the glory of often-nude Mathilda May, a deeply erotic memory for men of a certain age. Oh, and the energy-sucking concept of the movie is nifty, too.