In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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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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You burn 26 calories in a one minute kiss.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Historically, sweat has been an active ingredient in perfume and love potions.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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