Infidelity is the one act that changes everything. When you commit to a relationship, with or without the benefit of a ring, you don’t promise never to dance with anyone else. You don’t swear not to tell your problems or confide your secret ambitions to anyone but your lover. It’s not assumed you’ll never find a member of the opposite sex fascinating again. You do, however, promise not to make love to any of them.

Hm. I didn't promise that. Made a point of not promising that, in fact. We wrote our own vows, and I made sure the "Therefore shall a man... cleave unto his wife: and they shall be one flesh" thing wasn't there.

I mean, that way lies madness, doesn't it? I mean, sex is one hell of a lot of fun, by-- well, you can say "by design" if you believe in things like that. But we are hardwired to want to fuck: The survival of the species depends on it. It seems unnecessarily cruel to make a lifelong commitment dependent on your ability to resist the strongest instinct living things have. Pretty damned arrogant, wouldn't you say?

Or does that sound like a guilty man's rationalization?

We left out the "obey" part too. You know, just FYI.