Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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 are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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Two in five people in the world marry their first love.
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Historically, sweat has been an active ingredient in perfume and love potions.
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