Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Couples' personalities converge over time to make partners more and more similar.
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