Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Couples' personalities converge over time to make partners more and more similar.
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You burn 26 calories in a one minute kiss.
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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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