12/27/2013 10:19 am ET Updated Jan 23, 2014

Everything Science Taught Us About Relationships In 2013

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We hate to put a damper on your Christmas cheer, but your significant others are almost certainly lying to you about their holiday spending. Not that it matters, because buying your wife or girlfriend the perfect gift probably won’t convince her to sleep with you anyway.

When you do have sex with your partner, tread lightly. Ladies who fake orgasms are more likely to cheat, but women in committed relationships are more likely to orgasm in the first place. Speaking of infidelity, we found out that there could be a genetic basis for both emotional and sexual jealousy. That said, it’s not necessarily your imagination. If your spouse is acting extra-clingy, he or she might be cheating. By the way, cuddling could be the best thing for your relationship – snuggling releases the “love hormone” oxytocin, which will make you find your significant other much more attractive – but it’s also the most irritating thing a new partner can do in bed.

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