Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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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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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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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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