In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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Wearing red increases attraction.
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Parents receive 1 out of every 5 Valentines.
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