It is days before high school graduation, and close friends Brian and Joe and their girlfriends Lisa and Lana are so happy that nothing can bring them down. They all show up at their classmate Travis's house for a pre-graduation party for the senior class. Suddenly, a bright light interrupts the festivities. An alien ship has arrived, and the students are all taken aboard it. The ship disappears, but not before having a strange effect on Travis's parents, who are uncontrollably driven to have wild sex. Meanwhile Brian, Lisa, Joe, and Lana find themselves aboard the ship naked and hooked up to strange devices between their legs. The aliens have come to fulfill a fantasy that the four friends thought was a secret between them, and their wildest dreams come true in an orgy of gender-switching partner-swapping pleasure.