'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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Wearing red increases attraction.
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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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When dragonflies mate, their tails form a love heart.
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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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