The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Couples' personalities converge over time to make partners more and more similar.
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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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.
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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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