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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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The average person will go on a date at least 100 times before they finally marry.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Two in five people in the world marry their first love.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
14
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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