00:00 Date someone who has no family history of infidelity, who is in your league, and then make them happy.
00:03 I wrote my master's dissertation at Oxford on infidelity.
00:07 Here are three science-backed signs someone will cheat.
00:10 1. Family history of infidelity.
00:12 All human behavior is influenced by genetics.
00:14 For those interested in the science, basically, genes code for proteins and regulatory molecules.
00:18 These proteins and regulatory molecules build brain structures and impact brain function,
00:22 and then these influences on the brain also influence your personality and behavior.
00:25 One study of well over 7,000 twins and their siblings found infidelity to be 62% heritable in men, 40% heritable in women.
00:34 If you know their mom, dad, or sibling has committed infidelity,
00:37 they are more likely to do so as well than someone who has no such family history.
00:41 2. They're out of your league.
00:42 And I mean overall, not just in terms of looks.
00:44 Humans evolved to try and get the best mate they can.
00:48 If they can do better, they will.
00:50 3. They're not happy in the relationship.
00:53 And this is especially true if your partner is a woman.
00:56 Relationship dissatisfaction predicts female infidelity much better than it predicts male infidelity.
01:00 Date someone who has no family history of infidelity, who is in your league, and then make them happy.
01:04 Here are three signs you're getting cheated on right now.
01:06 First, your partner is unusually protective over their technology.
01:09 Now, I'm not suggesting that you should be able to go into their phone.
01:12 That can get super toxic.
01:13 I am saying, though, that if they're never leaving their phone out, never plugging their phone into your CarPlay,
01:17 they're doing that thing where they turn the phone face down so you can't see the notifications.
01:21 If you're seeing all those sorts of signs, take it as a clue that they might be hiding something.
01:25 Second, they're newly concerned with their physical appearance.
01:28 There's nothing wrong with keeping up with your looks in a long-term relationship at all.
01:32 But if your partner suddenly changes their interest in their looks,
01:35 it's possible, if this is a new behavior, that this is also for a new person.
01:39 Third, they don't want to talk about someone specific.
01:41 Oftentimes, when a person is getting cheated on, they have an intuition as to who they're being cheated on with.
01:46 If you've got someone in mind, bring them up around your partner and see if they want to change the topic.
01:50 Here are three signs your boyfriend's gonna cheat.
01:52 One, he has a wandering eye.
01:53 More accurately, a lingering eye.
01:55 One very cool longitudinal study of 233 newlywed couples found that men who looked away from attractive women other than their wives
02:02 100 milliseconds quicker had a 50% reduced likelihood of committing infidelity.
02:08 Two, he has a high body count.
02:10 I'm not a fan of the body count discourse, but at a population level, men who have been with more people are more likely to cheat.
02:17 A survey of 1001 Americans found that those who had slept with more than five people were twice as likely to cheat as those who had slept with less than five people.
02:25 Three, and again, I'm speaking at a population level, he's cheated on his past girlfriend.
02:29 A cool study by Kayla Knopp and colleagues, which I've discussed a couple times recently,
02:32 found that men who had cheated in their previous relationship were three times more likely to cheat in their next relationship than those who hadn't.
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