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From the liner notes

The most bizarre experiment in human sexuality! Frozen-faced automatons and a goofy-looking monster abduct a collection of sexual specimens--hippies, lesbians, stripper Gloria Prat--who are whisked off to the estate of crazy Dr. Humpp. There, with the aid of aphrodisiacs, "electronic control of the libido," and a talking, pulsating, disembodied brain in a jar, Dr. H turns his guests into "veritable lovemaking machines." He then drains "the blood forces of sex" from the couples, which he uses as an elixir to keep himself eternally young. Investigating the kidnappings, journalist Richard Bauleo quickly finds himself part of the story when he is partnered with Miss Prat on Humpp's telepathic sex machine. Another delirious crackpot cult classic, "The Curious Dr. Humpp is one of the wildest, wackiest mixes of sci-fi, monsters, and skin ever filmed!