A bearded anthropologist studies the habits of swingin' American teens while they enjoy the summer surfing, loving, and partying at the beach.

The first of the five official American-International "Beach Party" movies. Anthropology Professor Robert Orwell Sutwell and his secretary Marianne are studying the sex habits of teenagers. The surfing teens led by Frankie and Dee Dee don't have much sex but they sing, battle the motorcycle rats and mice led by Eric Von Zipper and dance to Dick Dale and the Del Tones. Look for Big Daddy's surprise cameo.—alfiehitchie

Teens Frankie and Dolores, who love each but have not really said the words, are on the verge of being officially engaged, but she wants him to see her as more than just "a girl" i.e. a sexual object. That's why Dolores, without having told Frankie before they arrived, turns what was planned to be their beach getaway for two into a beach getaway for the entire gang as she has invited all their friends to join them in being afraid to be alone with him. That move begins a sexual war between the two to get back at the other, Frankie wanting to make her jealous for changing their romantic vacation into a big party - the girl of his choice being the voluptuous Hungarian barmaid Ava - and Dolores wanting to be aloof to his actions. But Dolores may find who she believes is a man having the qualities she is looking for in Frankie, he much older Robert Orville Sutwell. Dolores has misconstrued Sutwell's intentions as he, not mentioning it to any on the beach as he infiltrates their party, that he is a scientist writing a paper on the primitive nature of the modern teen, they fodder for his research. In hiding behind his research and his old man beard, Sutwell can't see that his assistant, Marianne, is too a woman who has more carnal thoughts on her mind specifically with him. The entire situation at the beach is made all the more complex with the arrival onto the scene of the Ratz and Mice, a biker gang whose menace is dampened by their bumbling nature, especially that of their leader, Eric Von Zipper. All may be right in their collective world when they receive the "word" from Big Daddy, the wise overseer at the local bar who has thus far been silent.—Huggo