A nice overview on humans and their monogamy, also introducing this interesting thing called social monogamy.

LiveScience.com: Life’s Little Mysteries – Are Humans Meant to be Monogamous?

Some scientists view both social and sexual monogamy in humans as a societal structure rather than a natural state.

“I don’t think we are a monogamous animal,” said Pepper Schwartz, a professor of sociology at the University of Washington in Seattle. “A really monogamous animal is a goose – which never mates again even if its mate is killed.”

She added, “Monogamy is invented for order and investment – but not necessarily because it’s ‘natural.’”