Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Men fall in love faster than women do.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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The single biggest predictor of love is proximity.
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