'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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One in five long-term love relationships began with one or both partners being involved with others.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Two in five people in the world marry their first love.
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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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When dragonflies mate, their tails form a love heart.
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