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 left ear is more responsive to words of love and emotion whispered into it than the right.
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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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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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The single biggest predictor of love is proximity.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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