On some boats, sex is simply part of the job – and many crewmembers don't mind. One Swedish captain recalls having sex with an owner's wife – sex onboard right under the husband's knowing nose.

"He didn't mind and actually encouraged it," the captain said, with a shameless smile. "They hired me many, many times for repeated cruises."

One former crewmember recalls how a stewardess and chef got a huge tip from the guests of an all-male charter upon fulfilling their dessert order: the stewardess completely undressed, laid down and the chef artistically covered her in whip cream. The rest of the crew watched and laughed, but the captain later fired the Cool-Whip duo for crossing the line.