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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Wearing red increases attraction.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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