When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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Parents receive 1 out of every 5 Valentines.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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