'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
Research has shown that allowing chocolate to melt in your mouth produced brain and heart rate activity that was simliar to - and even stronger than - that produced with passionate kissing.
173
Kissing an infection-free partner is good for your teeth!
141
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Kissenger is a pig-shaped robotic device that lets you kiss someone over the internet.
5
Men who kiss their wives in the morning live five years longer than those who don't.
1k
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
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9