After thirteen years of engagement, the boring sex life of Rui and Vani is limited to one intercourse every other week. They decide to seek excitement with a threesome and they decide to invite Vani's cousin Silvinha to participate late night, but an accident interrupts their game. Rui and Vani unsuccessfully spend the night searching for for companion of a bisexual woman.

The film shows the day when Rui and Vani first met. It was at their wedding (with other partners). Vani was going to marry Sérgio, and Rui would marry Marta in the same church, following Vani's marriage. While waiting for the ceremony, they begin to talk. Complications ensue.