Paul Farhi wrote a really sensitive and smart column about Stella Walsh, IS conditions, and gender testing at the Olympics.
Walsh had no access to steroids in her day. And since her male organs were nonfunctional, Reiner says, she probably had partial or complete androgen resistance, which makes the body unable to produce or use the small amounts of testosterone that most women have. So it's even possible that Walsh was at a disadvantage compared with her competitors.
Interesting reading, and a nice companion to Jenny Boylan's op-ed in The NY Times a few weeks ago.
To fill out your gender Olympics reading, try Zagria's bio of Dora Ratjen.