Eskimo kissing, named for its prevalence among the Inuit, consists of two people rubbing noses together. A common misconception is that the practice arose so that Inuit could kiss without their mouths freezing together, but more likely the practice has to do with being able to catch the scent of another person. Many animals also are known to practice this behavior.
External links
The Science of Kissing (http://www.edwardwillett.com/Columns/kissing.htm)
Right from the longest kiss, to African custom on kissing, and from Eskimo's refrain from kissing to where kissing is prohibited.
Longest kiss - 29 hours by contestants in the "Breath Savers Longest KissChallenge" in New York on March 24, 1998.
In some places kissing is a crime - it's illegal in Indiana for a moustached man to "habitually kiss human beings", in Hartford, Connecticut it's illegal for a husband to kiss his wife on Sunday, and in Cedar Rapids, Iowa, it's a crime to kiss a stranger.
Kissing later developed as a way the mother could convey her love for the child.
Ingrid Bergman mused that "a kiss is a lovely trick designed by nature to stop speech when words become superfluous (14)." In other words, a kiss is an act that communicates unmistakably without words.
Kissing may have evolved as a way to increase the fitness of a species, but it quickly became intertwined with emotion.