Why do you think divorce hasn't made cheating obsolete?

We have always thought that people only cheat when they’re miserable. We’re committed to the notion of infidelity as a symptom of a problem. But, really, people who don’t get along and don’t want to be physical with one another and have lost their erotic intimacy — what’s to write about that’s [not] been said? But the people who come into the office and say, 'We love each other very much, but we have no sex' — that's when you begin to question the relationship between love and desire. What is the relationship between what fuels love and what entices desire? Is there something there that makes them not necessarily flow together the way we always want? The same thing began to happen with infidelity. To write a book about people who are miserable and have an affair, that’s obvious. But why do those people stay together? It’s usually because there are more important things in the marriage than love. There’s a lot at stake, like the fact that there’s a lot of fathers these days who want to be able to see their children every day.