I have seen several articles/editorials since Caster Semenya has resumed racing. But this one is by far the best. (I won't even link to the really problematic one from a male sportswriter from Kenya who seemed to have some sympathy for Semenya's situation but in the end he deemed Semenya not-quite-woman and stated that she should bow out gracefully from her competitive career.)
I recommend the above-linked editorial from the New Statesman in which writer Laurie Penny starts with Semenya's racing kit last week (it was pink!) and shares some (rumored) information about the extent of the testing Semenya was forced, by the IAAF, to undergo. If you have to look that hard and take pictures...guess gender isn't that obvious after all.