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Many are quick to label a person who strays from his or her marriage or relationship as a “cheater,” but it’s really not that simple. It’s time for our culture to wake up and smell the sex pheromones: monogamy is not natural for many, or probably even most, humans….

Marrying for love is a relatively new concept. Beginning with Enlightenment — the cultural movement of the 18th and 19th centuries — when the pursuit of happiness became a legitimate human pursuit, marrying for love slowly but surely became an aspiration in the Western world.

But for most of human history, marriage was primarily a socioeconomic transaction. Spending the rest of your life with someone was more about the protection of property and the sharing of labor than it was about romance.

The side effect of the rise of marriage as a romantic proposition was that sexual jealousy became a more prevalent ingredient in marriage than it had been previously. Over time, sexual fidelity has come to be regarded as the barometer of a successful marriage — regardless of what science tells us about natural human inclinations.

Does common make it right? What if even animals behave in the same way? Face it: Monogamy is Unnatural. CNN opinion piece.