[Cronos]

I DO know that. However, Red brought up a good point -- evolution can be either because of necessity or because the mate likes it (which since it means the guy gets to .... Is a necessity too!). For example peacocks' tails are due to this beauty in the eye of the peahen beholder.

[janette]

OK, that's correct.In very early human history it was all about survival. And mating is the main reason for us humans to be still here :-). Evolution is all about who and what is the best, and the best will go on.

[Redcloak]

Another case in point would be the appearance of Asians. When I was a boy, it was taught that they developed narrower eyes to protect their vision as they crossed the Gobi desert into China. Geneticists now know that the genes giving them their distinctive appearance developed after they'd reached what's now China. (Only ~14,000 years ago) Thus the gene didn't spread as a result of environmental pressure, but rather because of aesthetics. (Also, IIRC, the Gobi desert wasn't a desert when their ancestors would have crossed!)