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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40% of people who are rejected in romantic love slip into clinical depression.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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A man's beard grows fastest when he anticipates sex.
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Wearing red increases attraction.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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