Mark and Anne have been tempted by the idea of wife swapping since their first shared sexual fantasies. They have the desire, the determination and a watertight relationship. Only thing missing was the couple to swing with. But that small hurdle is overcome when they move next door to the sexy and exciting Johnny and Lisa, avid swappers and organizers of the season's largest swinging party. Mark and Anne are soon immersed in a tidal wave of new experiences. The only thing left for them to discover is whether or not their relationship is truly watertight.