When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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