If you've ever cheated - and, let's be frank - you tend to make a habit of it, you might be able to blame your genes. That's the verdict of New York-based anthropologists who claim people who are serial cheaters may have a particular genetic variation that means they simply can't stay faithful.
In tests involving college students, 50 of those who had the normal gene. Of course that still leaves more than one in five people without a genetic excuse for being a love cheat, but it also means half of those who do have the faulty gene are resisting their genetic predisposition to be unfaithful.
Or perhaps they're just particularly good at telling fibs.
But the big question is, if you could test a potential partner for the one-night-stand gene, would you do it?
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