Behind the Nudist Curtain (1964)

"It's all new, and oh, so intimate... A private-eye's discovery of WHAT MAKES NATURE GIRLS TICK!"

Private eye Sam Dennison is relaxing at a nudist camp when he receives an assignment to find international spy Mr. X, who receives information from night club entertainers around the world. Sam travels to Vegas, Hong Kong, Thailand, Paris, Haiti, Mexico, Hawaii, Berlin and Tokyo, watching lovely women perform, and stopping back at the nudist camp (which he is attempting to buy from its beautiful owner, Martha).