Lacking experience to write her research paper on sexual behavior, a 22-year old college student responds to personal ads to broaden her erotic horizons.

At his bachelor party, Jason has a one-night fling with Nikki, a radiant beauty with whom he forms an immediate bond. They agree to keep their secret locked away forever. Two years later, Jason, his wife, Andy and his fiancee plan a reunion weekend. Jason is shocked to discover that Andy's fiancee is Nikki. Now, secret and passionate affairs are played out.