Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Couples' personalities converge over time to make partners more and more similar.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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Wearing red increases attraction.
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Kissing an infection-free partner is good for your teeth!
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A man's beard grows fastest when he anticipates sex.
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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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