In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Couples' personalities converge over time to make partners more and more similar.
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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 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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