Innocent Taboo (1986)
Two buddies from the same neighborhood grow up and marry a pair of luscious and sexy sisters. Throughout the years the two families grow up side by side, never dabbling in the partner-swapping salaciousness that they all dream of. They get their chance when they’re all invited aboard the boss’ luxurious yacht. An erotically enticing potion is mysteriously mixed into their drinks, and the couples find themselves free to indulge their swinging …
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