Two couples are on a double date when they start talking about partner swapping. They decide it would be cool to try it out. The two couples then go to a local motel. They rent two rooms for the night, and the newly shuffled couples go to their respective rooms. One couple, in their room, go wild with each other. They make love for hours. When finished, one of the two rolls over on her side, props herself on one elbow, lights up a cigarette, looks at her partner, and says: "I wonder how the guys are doing?"