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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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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