The film has almost no blood, gore, or even remotely frightening scenes. Instead, the film is mostly a series of soft-care sex-scenes; a woman masturbates in bed, another dances nude before having sex with a female nurse (homosexuality here is being treated as a disorder), a third is a nymphomaniac who has sex with a gardener, and so on. The women are being stalked in their rooms and on the grounds by a masked murderer clad entirely in black (and wearing a cape!). The doctors and staff and distraught and confused by this turn of events, but do little to secure the grounds or protect their charges. Having orderlies about might make chance sexual encounters less likely.
The ending is tact-on to the film, one of the women's jealous lovers himself has gone manic. He is quickly dispatched after being discovered in the last few minutes of the film. Scooby-Doo cartoons feature a better build-up to the reveal at the end.
Asylum Erotica isn't a very good horror film. It not even entertaining as soft-core porn. Mostly, it is 86 minutes of your life that, if you watch the film, you will never, ever, get back.