Parents receive 1 out of every 5 Valentines.
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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 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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