yes there is, in sociological and anthropological terms, and much ink has been 'wasted' on this subject!
but anyway, a very thorny subject and im always reluctant to get involved but then i always do
pm is fun because it lets the imagination run wild. but please let's not get too prescriptive! no need for darker or lighter skinned characters to make people feel inckuded! it's the equivalent of 'baddy' eyes in the pirates theme. just give us normal, classic klickies, and our imagination can do the rest ...