To spend her summer on an "educational" cruise in the company of her mother and married sister does not entirely thrill young Amanda Craig. Now school is out, the precocious beauty is keen to abandon theory and undertake some hands-on learning - with real men.
But there's a shock in store for all aboard Dr Leo Weissbinder's luxury liner. The purpose of the voyage is to provide material for the doctor's infamous erotic survey. All passengers are filmed and monitored as they respond to sexual surrogates like the dextrous Dexter Calvert and the versatile Myra Starr. And as the halter of inhibition falls from all three Craig women, it's not just the buxom Manda who volunteers for experiments in lust . . .