One in five long-term love relationships began with one or both partners being involved with others.
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Two in five people in the world marry their first love.
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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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Wearing red increases attraction.
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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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The single biggest predictor of love is proximity.
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The average person will go on a date at least 100 times before they finally marry.
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