'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.
255
Historically, sweat has been an active ingredient in perfume and love potions.
309
According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
14
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
44
You burn 26 calories in a one minute kiss.
605