According to Christopher Ryan and Cacilda Jethá, the authors of the new book "Sex at Dawn: The Prehistoric Origins of Modern Sexuality," the state of the American marriage is awfully grim. We have a stratospheric divorce rate and a surge of single parents. Couples who stay together are often trapped in sexless, passionless unions. An entire industry — from couples therapy to sex supplements — has emerged to help people "rekindle the spark" without straying from the confines of monogamy.
But Ryan and Jethá also have a theory for what's causing this misery: From a biological perspective, men and women simply aren't meant to be in lifelong monogamous unions.
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