Mrs. Smith's Erotic Holiday (1982)

Bored with her humdrum sex life, a couple go on a carnal cruise on the high seas to put an erotic kick back in to their sinking libido. As the boat navigates the waves, the Sex Mistress - whose job it is to titillate and amaze - navigates her way through every couples' stateroom and leaves a tidal wave of lust in her wake. During the seven-day cruise, each stateroom competes against each other for the most inventive sexual encounters. Pipe yourself aboard to a luxury of ocean scenery, and a bounty of beauties and rock the boat - in and out of port!