As you can see from this site, only fruity teenage girls pass A-levels. Or is it just that the entire news media only print pictures of fruity teenage girls opening their results because the implied reader is a lecherous heterosexual male encouraged to view all human beings - but especially teenage girls - as sexual commodities.
If the Daily Telegraph and the Mail could get away with naked teenage girls on the front page (white and upper-class, naturally), they would, but until then, results day is a fixed highlight of their year.
But sadly, it does contribute to ideas of attractiveness and to excluding non-fruity-teenage-girls from the Platonic Academy. Even worse, Badminton College (very expensive exclusive girls' school) even sends newspapers speculative shots of their fruitiest girls to tempt the photographers down on results day. I believe the word for that is 'pimping'.