Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Men fall in love faster than women do.
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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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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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