Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Men fall in love faster than women do.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Kissing an infection-free partner is good for your teeth!
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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.
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