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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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