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.
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About Dan Savage
Dan Savage was a contemporary American sex advice columnist and gay rights campaigner. Daniel Keenan Savage is an American author, media pundit, journalist, and LGBTQ community activist. He writes Savage Love, an internationally syndicated relationship and sex advice column. Read more on Wikipedia →