From "Sexcula: Canada's First Porno" by Will Sloan:
Halfway through Sexcula—a 1974 Canadian film released on DVD, by Synapse Films, for the first time last week—a gorilla is unleashed during a sex party at the shapely Dr. Fallatingstein’s castle. Why the gorilla is there in the first place is uncertain. We know from the doctor’s lab equipment that she is a scientist, and we know from her peculiarly sexual inventions (i.e. a “Female Pleasure Robot”) that she is mad; perhaps he’s a botched experiment. Whatever his purpose, there is no doubting his libido: gorilla or no gorilla, he gets down on that gravelly floor and has sex with a stripper.