Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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40% of people who are rejected in romantic love slip into clinical depression.
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The single biggest predictor of love is proximity.
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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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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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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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