The typical person spends about 600 hours having sex between the ages of 20 and 70.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Two in five people in the world marry their first love.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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