Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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40% of people who are rejected in romantic love slip into clinical depression.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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