Couples' personalities converge over time to make partners more and more similar.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
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
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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