Why are some people unfaithful? Are they born that way? Greg and Mitch from ASAPScience look at the science behind the human need to cheat in their latest YouTube video. It seems that something called “extra-pair mating” (aka infidelity) is a common human behavior linked directly to dopamine, which makes us feel happy.

Another hormone, vasopressin, also plays a role in how likely a person might be to cheat.

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