A man and wife are sucked into a whirlpool (in the wife's case, hot tub) of supernatural sex by a trio of randy, well-endowed witches.
Young married couple Rob and Laura move to the peaceful, friendly town of Breastford and right away are made to feel at home by the welcoming members of the Breastford Womens Association. They soon realize that something is amiss, and they discover the reason: Doc Brady, the town's mayor, has invented a device that, at the push of a button, turns women into insatiable, sex-crazed robots.
A hiker becomes lost in the wilderness and comes across sexually insatiable mutant cave women who hold him captive for their carnal enjoyment. Two couples that are friends of his go off to try to find and save him, unaware of his true predicament.
