A peer relationship is one where the partners experience an affectionate, companionate coupledom. They are friends. They are the product of the egalitarian model; they are good life partners, but are often less sexual.

Affairs can be powerful detonators. They can invigorate a marriage that's flat, jolt people out of years of complacency. Fear of loss rekindles desire, makes people have conversations they haven't had in years, takes them out of their contrived illusion of safety.

Most affairs do die a natural death. Today, you look at your partner's phone to find out the weather, and you find out about a lover. It has never been as easy to cheat as it is today, and it has never been harder to keep a secret.

Today, monogamy is one person at a time.

For me, the constitutive element of an affair is the secrecy. It is the secrecy that leads to the lying, to the deception, to the duplicity. It is the structure of an affair - not the sexual or emotional behavior or what people actually are doing.

For some people, the experience of sexuality is that they are entirely inside their body, but others feel they have totally transcended the physical boundaries of their body. Transcendence is the ability to no longer feel you are contained within the physical world. For many people, the definition of spiritual is a sense of complete abdication of the self. For some people, it's union with another that transcends the borders between where one stops and where the other person starts and creates a sense of infiniteness and timelessness.

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.