Iris’s anger had been immense. I didn’t know how to react. I was a bit tipsy, and what she’d said—that I had to ask David for permission to have sex with my own wife—struck me as utterly humiliating. David didn’t know how to react either. We looked at each other as if trying to understand Iris’s anger. It was clear that that day, and perhaps the days before, had been very difficult for her, and she’d had to put up with be...