Heavenly takes Damon on an emotional journey, leading to revelations from his past. All the couples get an eye-opening group sex therapy session, where Jackie must come face to face with the state of her marriage. During a medical mission to help island locals, Eugene gets a major health scare. Later, there's trouble on the high seas as a luxury yacht ride heads into stormy waters. Mariah and Simone confront Quad on her selfish behavior. Can the group survive or will it be woman overboard?