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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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The single biggest predictor of love is proximity.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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