 Virginal nerd Jon Pigeon (Barry Andrews) works in a peculiar sex research institute in which patients run about the corridors naked, nude aerobics are encouraged and where no man is safe from a crotch grabbing old tea lady. In order to seduce office secretary Cheryl (Sally Faulkner), Pigeon invents a machine nicknamed Agnes which emits a  sonic aphrodisiac  that can turn any man or woman into an over-lustful sex maniac. While his attempts to zap Cheryl end in disaster, Pigeon has some fun turning the  sexy ray  on his bullying boss Nutbrown (James Booth) and clean up campaigner Mary Watchtower.