Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Men who kiss their wives in the morning live five years longer than those who don't.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Men fall in love faster than women do.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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