Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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