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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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40% of people who are rejected in romantic love slip into clinical depression.
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Kissing an infection-free partner is good for your teeth!
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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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