When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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