Long-term marriage between two complex adults is a very complicated dynamic to navigate. People invent all sorts of ways to manage that. It’s of course possible that the CFO’s wife thought she was in a rigid, life-long monogamous relationship with a purely heterosexual male and is shocked and betrayed to learn otherwise, but it’s also very possible that she was well-aware that he isn’t any of those things, and the spousal agreement between them permits this flexibility on one or both of their parts.