You burn 26 calories in a one minute kiss.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Men fall in love faster than women do.
32
For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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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.
69
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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