The evolution of kissing

Kissing is so common that we rarely ask why humans touch their lips together to show affection. One obvious answer is that it feels good. Densely packed nerve endings make your lips some of the most acutely sensitive regions of your entire body, and few things get them more riled up than a kiss. But where in humanity's … » 10/12/12 11:35am 10/12/12 11:35am