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 who kiss their wives in the morning live five years longer than those who don't.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Speed dating was invented by a Rabbi in 1999.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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