In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Couples' personalities converge over time to make partners more and more similar.
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Men fall in love faster than women do.
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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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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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