Modern infidelity is different than traditional infidelity and sits on top of the romantic ideal that you find "the one" and that if you have everything that you need at home, you have no reason to go looking elsewhere. And if you have an affair, it's a symptom of a flawed relationship. If you don't apply the deficiency model to the relationship, then you apply it to the person. The person who strays is selfish, immature, addicted suffers from insecure attachment. And the person who doesn't stray is the committed partner: mature, stable, and non-selfish.

I think love is often a bit selfish, even before we had consumerism. That's not new. A consumer society gives you the illusion of having massive amounts of choice and saddles you with the freedom of being able to dabble in that choice. And at the same time, you are left with the tyranny of self-doubt and uncertainty about whether you made the right choice.

There is not one person who can fulfill all your needs. You may choose a partner who is your intellectual equal, and he may not be your most compatible sexual partner. And then there's the duality between security and adventure. A relationship that gives you plenty of novelty, and adventure, may not provide the stability you long for. Time, continuity and familiarity with somebody gives you other things in life but won't necessarily give you the kind of intense lustful experiences that you may have when you first meet someone and are curious about penetrating the mystery of them.

On some level we trade passion for security, that's trading one illusion for another. It's a matter of degree. We can't live in constant fear, but we can't live without any. The fear of loss is essential to love.

Today, monogamy is one person at a time.

Even a good marriage leaves people with longings for certain things their marriage will never be. So, do they accept that, make compromises, and say, "You can't have everything in life," which is what we always did? Or do they say, "I deserve more. I want to experience that thing and, you know, I have fifty more years to live than I used to." It's not necessarily that we have more desires today, but we do feel more entitled to pursue them. We live in this "right to happiness" culture, and yes, we do live half a century longer than we used to.

The meaning of secrecy is very different when the model of love is one of transparency. So to understand the politics of secrecy and revelation, you need to understand the larger culture in which the couple lives and also the culture of the couple itself. What does intimacy mean to them? Where does the couple draw the line between togetherness and separateness? That's what informs you. You always ask, "What would happen if I tell? What would happen if I don't tell?" Sometimes, the partner doesn't want to know.