Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Two in five people in the world marry their first love.
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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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The average person will go on a date at least 100 times before they finally marry.
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Historically, sweat has been an active ingredient in perfume and love potions.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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