Straight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage.

The mistake that straight people made was imposing the monogamous expectation on men. Men were never expected to be monogamous.

The cultural expectation should be if there's infidelity, the marriage is more important than fidelity.

Men were never expected to be monogamous.

I don't think people should do things that make them miserable. And if being an in-shape, sober, monogamous heterosexual makes you miserable, don't do it. And if being an in-shape, sober, monogamous heterosexual makes you happy, do it.

It's kind of like Marriage Encounter, only it's for couples getting married.