This movie is about a doctor who kidnaps people, couples who are having sex. He takes them to his mansion where they are being kept as prisoners. He injects his subjects with a substance to 'enhance' their sexual abilities. The curious doctor then forces the abducted people to have sex. While they are making love he drains a fluid from them. He needs this to prevent himself from being transformed into a monster. He gets his instructions from a talking brain.
An undertaker and his two friends, who are restaurateurs, make business by going out on town and killing people; the restaurateurs use body parts for their menu, the entrepreneur buries the rest.