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Why is it so impossible to imagine that a couple could reconcile -- really work things out and reconcile -- and be happy together after a sexual infidelity? I know people who have done it.
My husband and I are monogamous, but one thing that I've learned from my polyamorous friends is that sex is only one part of a marriage, and that a couple's life together depends on fidelity in a much broader sense. Frankly, I can think of a lot of more unforgivable things that one spouse could do to another.