One in five long-term love relationships began with one or both partners being involved with others.
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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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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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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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