Caleb and Mallory, an engaged couple, were forced to travel to Palm Springs over the weekend to attend the 25th ceremony at which Mallory's parents reaffirmed their wedding vows. The estranged couple discovered the secret of Mallory's parents' happy marriage, which is to let a third party join their sex life. Caleb and Mallory were disgusted at first, but wondered if it would improve their relationship. To celebrate their re-engagement, they spent a wild night looking for their third party without any conditions. Although this experience is new and interesting, it reveals deeper problems between the two and threatens their future.