Just read an article about a researcher who claims that monogamy/bonding may be in the genes.
"We were actually able to take the gene from the prairie vole (small, furry rodents that have underground burrows) and inject it into the brain of the meadow vole, which normally should not form bonds," said researcher Larry Young at Emory University. "And when we did that, the meadow voles were actually able to form an attachment to their mate."
What do you think? Is bonding innate, learned, otherwise?