Comic tensions arise from Luke's efforts to keep Michelle at a distance, Max's defensiveness about his sister, Luca's half-hearted resistance to Max's affections, and Luke's confused aggression toward Max. When Michelle discovers that Luke had sex with Dr. Catchadourian, she feels betrayed. Hoping to find Michelle, Luca seeks out Max to profess deep affection for Michelle and remorse for betraying her. Max is touched by the apology, and reveals that he is actually Michelle, also a zerophiliac. They make love repeatedly, changing sex mostly in sync with each other, but occasionally finding themselves the same sex. It ends with the happy couple apparently resolved to their 'condition' and past any questions of their sexual identity.