Evidently more than a few female olympic athletes are intersex:
http://www.nytimes.com/2014/10/07/sports/sprinter-dutee-chand-fights-ban-over-her-testosterone-level.html
There's a petition up for her on Change.org (http://www.change.org/p/let-dutee-run-don-t-ban-women-athletes-for-high-natural-testosterone).
This is so messed up, they should let her compete.