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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Women rate men more attractive if other women are looking and smiling at him.
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Yawns are more contagious among people with closer relationships.
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40% of people who are rejected in romantic love slip into clinical depression.
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When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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