Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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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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Kissing an infection-free partner is good for your teeth!
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The single biggest predictor of love is proximity.
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Parents receive 1 out of every 5 Valentines.
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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 Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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