Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Couples' personalities converge over time to make partners more and more similar.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Men who kiss their wives in the morning live five years longer than those who don't.
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