She thought she was the one who had finally lassoed the bull, but she was really just the one who was there at the end. Before her, he needed a harem, and would settle for nothing less. But he became tired of their jealousy, realized it would be easier to have just one. The society was organized such that it would be more simple and easy if he was just with one. He realized this over time. And his potency had diminished over time. He didn’t need a harem anymore. He couldn’t go round after round. He could only go run one round per week. And by then it just made sense to have only one.