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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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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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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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The average person will go on a date at least 100 times before they finally marry.
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