No claimed reasons turn out to be very informative, but…
While his studies are quite obviously limited by focusing on American college students, when placed alongside the cross-cultural data and evidence from animal research, it seems reasonable to conclude that the close contact that kissing offers facilitates a good deal of sniffing. Whether we’re aware of it or not, kissing may allow us to judge the potential suitability of those we desire.
And that’s why the occasional chapped lip, or mistaken bite of this hypersensitive part of the body, is all worth it.
Case you wondered. Brits pay for this. See also: evolutionary psychology
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