According to estimates of the journal Scientific American, the most kisses happen on Valentine's Day, with 65 percent of kissing her head tilted to the right. The habit of tilting your head in a certain direction is formed even during fetal development.
The science of kissing is called philematology.
Lips are 100 times more sensitive than your fingers. Not even genitals have as much sensitivity as lips.
The Kama Sutra lists over 30 types of kisses, for example "fighting of the tongue".