A Battle of the Sexes?

Since the beginning of time, the male species has been known as the predators, the protectors and the conquerers. Somehow in the midst of history, some double standards and hypocrisies have shown their ugly heads. For example, why is it okay for a man to have slept with half the neighborhood, but if a woman has more than a few partners she is considered a borderline hooker and not "wifey material"? Why is it okay for a married man to have multiple side flings because "he loves women", yet if a married woman has an affair she is considered a "home wrecker" and a mistress? I just don't get it. How did these double standards come into place amongst our men and women? Does it really matter who does what?....or do women really carry more of a burden to "do right"?