Monogamy and infidelity. Just like the old song says about love and marriage, “you can’t have one without the other”. Well, you can’t have infidelity without the assumption of monogamy, at any rate. Can you have monogamy without infidelity?

Stats on the rates of infidelity vary widely. (Because people lie about this, don’t they?) Men stray more than women; well-educated, financially independent women stray more than their poorer sisters. Can you have faithful monogamy? The short answer is yes, you can. But can you reasonably expect it?

I have a friend who has decided, not without a smidge of regret, that, no, you can’t. Not for men, at any rate. In her marriage, they deal with this by bringing an “other” into their (lively and satisfying) bedroom virtually, through role-play. Will they one day bring in a real, live third party? It’s a possibility, maybe, perhaps, one day they could.

I’ve been cheated on. Though we went into the marriage pledging life-long monogamy, infidelity, I discovered, was not a deal-breaker for me. However, if one of us could get some outside goodies… I suggested an open relationship. Sauce for the goose, and all that. That did not fly. (Double standard, anyone? One of the many reasons we’re no longer married.)

So I did a little cheating of my own. Obviously.

That’s why most women step out, apparently. Retaliation, anger, revenge, dissatisfaction. Loneliness is in there, too. And men? I think my friend might be right: they’re just wired that way. Sexual opportunists. Even when they’re not actively seeking opportunity, when it knocks they’re unlikely to shut the door on it.

I know a woman who was in a non-mongamous relationship for a couple of years. They didn’t slide into it unawares, in some state of (deliberate, semi-deliberate) denial. They talked about it for a couple of months first, they set out some ground rules, and when they entered into it, it was always with the understanding that this was an “experiment”. The agreement also included a sunset clause: when one wanted to stop, they would both stop.

That sort of thing takes a lot of confidence in the home relationship, in each other, in your own sexuality. It’s also hugely risky. In this case, after a couple of years, they called it off and returned to monogamy. Several years later, they are still together, still monogamous, and, to all appearances, happy.

Infidelity destroys marriages. But why?

It isn’t inevitable. If infidelity is an automatic deal-breaker, then yes, the marriage will end. If both parties knew that going in, then the party who stepped out is a fool — or wants the marriage to end.

But why would you set yourselves up for that? Why make it a deal-breaker?

I have come to the conclusion that monogamy is not essential. In fact, I’m rapidly reaching the point where I think it’s a little bizarre that we, societally, adhere to it as a standard expectation.

Me, I think that monogamy as a laudable goal. It’s certainly the safest course, for all manner of reasons, physically, emotionally, relationally. Still, what if we could hold to that idea, while recognizing that occasional infidelity happens? You could see it as part of normal relationships, or perhaps a regrettable example of human frailty, but not a moral evil so repugnant that the marital relationship must cease, forthwith. If we could make this mental shift fewer relationships would founder on the rocks of a fling.

I know that won’t work. People are not so clear-thinking when sex and emotions are involved. People are inconsistent and unpredictable. Objectivity and fair-mindedness are hard to achieve and maintain.

So. Monogamy as the expectation, with infidelity kept firmly illicit and a tightly-guarded secret, is probably the only viable way to go.

But some days, I think that’s a shame.