Curious Dr. Humpp
This movie is about a doctor who takes 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 abduct 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 stranger. He gets his instructions from a talking brain.