Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Historically, sweat has been an active ingredient in perfume and love potions.
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You burn 26 calories in a one minute kiss.
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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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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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