Deflating the Myth of Monogamy

"There is no question about monogamy's being natural. It isn't. But at the same time, there is no reason to conclude that adultery is unavoidable, or that it is good. "Smallpox is natural," wrote Ogden Nash. "Vaccine ain't." Animals, most likely, can't help "doing what comes naturally." But humans can. A strong case can even be made that we are never so human as when we behave contrary to our natural inclinations, those most in tune with our biological impulses. "

DEFLATING THE MYTH OF MONOGAMY
David P. Barash http://www.trinity.edu/rnadeau/FYS/Barash%20on%20monogamy.htm