Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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40% of people who are rejected in romantic love slip into clinical depression.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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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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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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