Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Wearing red increases attraction.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Speed dating was invented by a Rabbi in 1999.
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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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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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