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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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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Two in five people in the world marry their first love.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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