One in five long-term love relationships began with one or both partners being involved with others.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Parents receive 1 out of every 5 Valentines.
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Wearing red increases attraction.
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When dragonflies mate, their tails form a love heart.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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