Speed dating was invented by a Rabbi in 1999.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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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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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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