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Beautiful co-ed Vivian is known as the "Sigma Siren" because of her reputation as a Rawley campus flirt and femme fatale . All the members of the university rowing team fall for Vivian, except Bob North, who is devoted to his sport. One day, Vivian tries to attract Bob's attention by pretending to drown in a river, but after rescuing her, Bob realizes that he has been tricked. Later, when Bob returns Vivian's dress to her sorority, the Theta Beta House, the other girls open the package and tease him. Driven to distraction by his suspicion that Vivian is merely toying with him, and that the person she is really infatuated with is Morley, a Kappa man, Bob's performance on the crew begins to falter. As a result, he is taken off the team and replaced by Morley. When Bob takes back the pin he gave to Vivian, she becomes angry and tells him that she and Morley are engaged. On the day of the big homecoming race, Bob is reinstated on the team because Morley has suffered a broken arm. Still distracted by thoughts of Vivian, Bob rows poorly and causes his team to fall behind, until he is told that Vivian has rejected Morley and will be waiting for him at the finish line. Newly inspired by the news, Bob rows his team to an easy win. After the race, Bob gains Vivian's admiration when he performs a daring rescue and saves the drowning coxswain and his girl friend Dizzy. Vivian then shows her true feelings for Bob by showing him her heart-shaped pin collection cushion, which now only sports Bob's pin.