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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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
16
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
40% of people who are rejected in romantic love slip into clinical depression.
72
Couples' personalities converge over time to make partners more and more similar.
235
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44