As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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Speed dating was invented by a Rabbi in 1999.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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