In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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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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Wearing red increases attraction.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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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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Parents receive 1 out of every 5 Valentines.
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When dragonflies mate, their tails form a love heart.
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