Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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The average person will go on a date at least 100 times before they finally marry.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Historically, sweat has been an active ingredient in perfume and love potions.
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Speed dating was invented by a Rabbi in 1999.
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