The 'Science Of Kissing'
Socializing is found across the animal kingdom, but osculation — or kissing — seems to a human behavior. How did it start and why? The Science of Kissing author Sheril Kirshenbaum discusses the history and biology behind kissing.
Source: http://www.npr.org/2011/02/11/133686008/The-Science-Of-Kissing?ft=1&f=1007