Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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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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