Is monogamy realistic?

CNN Living: “Lipton and Barash, who have been married 32 years and are the co-authors of ‘Strange Bedfellows’ and ‘The Myth of Monogamy,’ said serial monogamy may be more realistic — a model in which people move from one committed long-term relationship to another and choose partners for different reasons at different stages of their life.”

Mollie Ziegler Hemingway comments at GetReligion: “Now, I don’t know what version of history they’re teaching A. Pawlowski and the story’s editors at CNN, but I’m pretty sure that fidelity in monogamy was never something achieved with perfection by any group of people at any point in history. Monogamy isn’t something that has been valued because it is easy or ubiquitous. In fact, it might be valued precisely because it goes against human nature.”