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Frankie takes his girl friend, Dolores, to a beach house in southern California for a surfing vacation. Upon arrival, he is dismayed to find a crowd of their friends there, invited by Dolores. From an adjoining house, their beach antics are observed by anthropology professor Sutwell and his secretary, Marianne, who are doing research on the sex play of teenagers. Meanwhile, Frankie has become angry with Dolores and plans to avenge himself by feigning a romance with voluptuous Ava, a waitress at the local beer and rock and roll establishment. When the professor rescues Dolores from the unwelcome attentions of Eric Von Zipper, a leather-jacketed motorcyclist, they become friends, and Frankie becomes jealous. As the apparent romances develop, the teenagers discover the professor's research papers and realize what he is doing. At the beer hall, Professor Sutwell is confronted by the irate youngsters and the cyclists. A pie-throwing brawl ensues which finally clears up the misunderstandings; Frankie and Dolores are reconciled, while Professor Sutwell realizes that Marianne is the woman for him.