I read an article by Chip Walter in the Feb/Mar edition of Scientific American Mind entitled "Affairs of the Lips" and learned, amongst other things, the following little tidbits:
A kiss triggers a cascade of neural messages and chemicals that transmit tactile sensations, sexual excitement, feelings of closeness, motivation and even euphoria.
Kisses can convey important information about the status and future of a relationship. At the extreme, a bad first kiss can abruptly curtail a couple's future.
Kissing may have evlolved from primate mothers' pracice of chewing food for their young and then feeding them mouth-to-mouth. Some scientiest theorize that kissing is curcial to the evolutionary process of mate selection. A kiss may convey subconscious information about the genetic compatibility of a potential mate.
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