Some people cheat on their partners. Others wouldn’t dream of it–the risk is too huge. A new video from ASAP Science lays out how genetic differences in the neurotransmitters that promote risk-taking and social bonding might influence people’s willingness to stray.
And while the video focuses on “extra-pair matings” in humans, it’s worth pointing out that the behaviour isn’t unique to us: biologists have found that lots of other animals that appear monogamous–from splendid fairy wrens and indigo buntings to tree shrews and the convict cichlid fish–are also getting a little on the side.
This post originally appeared on Throb, Gizmodo's blog for all things sex