In this sexy comedy, an innocent, but attractive virgin heads off to find adventure in the Big Apple and winds up falling in love. The highly principled lass goes to the New York apartment of her airline pilot brother to escape her over-amorous fiance who is increasingly unwilling to wait until their wedding night. Her brother supports her decision to stay pure and tells her that men prefer to marry virgins. He then secretly makes new plans to spend a spicy weekend with his lover in another city. Unfortunately, he is called to work after he makes his plans and is unable to contact his girl friend to tell her. Meanwhile, his innocent sister, left alone in the apartment, discovers that her brother lives by a double standard. Enraged, she decides to become a swinger too and so boards a downtown bus where she encounters a handsome, worldly bachelor. They are both attracted to each other and spend a lazy Sunday sightseeing and falling in love. A heavy downpour leads the drenched couple to the pilots apartment where they dry off. It's all innocent enough, but when both the repentant fiance and the girl's brother show up it's comical chaos.