Shivers

The residents of a suburban high-rise apartment building are being infected by a strain of parasites that turn them into mindless, sex-crazed fiends out to infect others by the slightest sexual contact.

Shivers (also known as The Parasite Murders, They Came from Within, and Frissons for the French-Canadian distribution) is a 1975 Canadian science fiction body horror film written and directed by David Cronenberg and starring Paul Hampton as Roger St. Luc, Lynn Lowry as Nurse Forsythe, and Barbara Steele as Betts. The original shooting title was Orgy of the Blood Parasites.