In your marriage, it is understood by both your wife and you that her sexual pleasure takes complete priority over yours. So even though it has been months since the last time she let you have sex with her, you didn’t have to think about it very long to say that she should have sex with her boyfriend tonight instead of with you.
This is based on actual events. If I was home when my wife had a date I liked take photos of her before she left. I started doing this so many years ago that the first photos I took were done on film. Of course that meant I would have to take the roll of film to a shop to get developed. I remember I would be so excited to see the pictures that I would take it in to get processed even if there were still several exposures left on the roll. The pictures were never risqué, but they were, and still are, the most erotic photos in the world to me.
This is based on a true story. I was leaving for an extended business trip and had asked my wife not to go to her boyfriend's. She had been seeing him quite frequently and I just wanted to connect before leaving town. She had agreed to stay home, but at the last minute he called and convinced her to come over to his house. It was the only time I can think of that I got my feelings hurt. At the same time the fact that she wanted to be with him more than me was also an incredible turn on in some weird way.