I wonder about this often. It seems so obvious to me, but maybe my radar is calibrated differently. I would LOVE to do an experiment where men are given an opportunity to compare two females side by side, in an environment where they can be honest without fear of repercussion, and with an eye to comparing "mature" women with all the scars of aging against the perfect complexion of youth. I know most men aren't into the prepubescent form, but girls develop younger than most people realize, and I have anecdotal evidence of my own of full grown men in less upper class communities going after girls of 13, 14 on a regular basis, until they figure out how old (or young) they are. A regular basis, mind you. There's still a stigma about it, but there's less of the illusion that this is anything other than the way nature intended it.