Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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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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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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You burn 26 calories in a one minute kiss.
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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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