Johnny is a successful banker who lives in a San Francisco townhouse with his fiancée, Lisa. They share an intense intimate relationship characterized by constant, passionate lovemaking. Despite this idyllic existence, Lisa has inexplicably become dissatisfied with her life, and one afternoon confides to her best friend Michelle and her mother Claudette that she finds Johnny boring. Although Michelle advises her to be grateful for what she has, and her mother counsels her that financial stability is more important than happiness, Lisa decides to seduce Johnny’s best friend, Mark.