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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Men who kiss their wives in the morning live five years longer than those who don't.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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Wearing red increases attraction.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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