Earlier quoted context omitted.
It's not. Such a thing would be impossible. Look up "gender socialization" and read about girlhood: http://www.metafilter.com/121190/teenage-girls-they-havent-b... http://www.theguardian.com/lifeandstyle/womens-blog/2014/jan... http://sodisarmingdarling.tumblr.com/post/34106027759/what-i... http://rebeccahains.wordpress.com/2014/01/20/is-my-son-smart...
I think what's happening here, and in a lot of other cases, is that culture [0] tends to sieze on real (in this case IMO) asymmetries (girls care more about appearance than men) and blow it far out of proportion. I'm not justifying it, not even close; I find it horrifying. I'm saying that it has a seed in reality, mixed with a freight of repression and poorly-handled social revolutions, a beautiful thing corrupted. Y…
The articles are more strongly consistent with the theory of gender socialization -- that the media et al coerces girls to focus (obsess, kill themselves over,) appearance, and without it it would be impossible to say to what degree such a thing as actually "biological". The rational course of action is to assume an absence of such a theoretical reality until evidence is found, just as with anything.