In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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One in five long-term love relationships began with one or both partners being involved with others.
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The average person will go on a date at least 100 times before they finally marry.
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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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The single biggest predictor of love is proximity.
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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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