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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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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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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The average person will go on a date at least 100 times before they finally marry.
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Two in five people in the world marry their first love.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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Speed dating was invented by a Rabbi in 1999.
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