When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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Two in five people in the world marry their first love.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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