By Dr. Alan Altman and Dr. Marianne Brandon
Just as we saw the evolution of bigger beaks in Galápagos finches so they could break seeds for eating, we're seeing an evolution in how humans engage in relationships. Monogamy, unfortunately, isn't natural for primates and mammals. When Natalie Portman's character in the upcoming movie, "No Strings Attached," said, "I think monogamy goes against basic biology," she was, unfortunately, correct.
We want to believe that monogamy is natural. We want to believe that passion easily lasts a lifetime. The truth is, we're mammals. Only 3% of mammals are naturally monogamous. For us humans, that means some of us are going to be more prone than others toward monogamy -- based on our DNA, our personality, and a variety of different factors. We're just now researching what it really means for people, and how to tell who's more likely to stay with one partner. (To help our doctors' research, click here to take this confidential survey.) About half ofRead More »from 6 Evolutionary Reasons for "No Strings Attached" Relationships