'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
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
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
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Kissing an infection-free partner is good for your teeth!
141
Men who kiss their wives in the morning live five years longer than those who don't.
1k