The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Two in five people in the world marry their first love.
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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.
28
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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