Let me pop down a quote and link to the article...
"His team's analysis reflects all of human history, and modern monogamy has not even left a blip in our genomes. "I don't know how long monogamy has been with us," Hammer says. "It seems it hasn't been around long, evolutionarily."
Besides, "most societies practice some form of polygamy", he says. Even if most Western men don't take multiple wives, men tend to father children with more females than females do with males, a practice called "effective polygamy".
"It's not unexpected," says Dmitri Petrov, an evolutionary geneticist at Stanford University in California. "Polygany is something you would expect to find." Petrov and his colleagues uncovered the same genetic pattern in fruit flies."
I think this is just fairly indicative of us being the norm (as if we didn't know that already), whereas Monogamy is simply a 'recent' societal/religious imposition.
[Original Article here]
Cross-posted to poly_r_people_2