There's been a story in the news lately about a runner from South Africa who has been requested to submit to testing http://sports.espn.go.com/oly/news/story?id=4409318". I don't know enough about the story background to know exactly the reason why her gender is in doubt. She does look lean, but all athletes look lean. I took a psychology class a long time ago that addressed gender issues. As I recall, when a baby is born with ambiguous gender, the current treatment is to observe the child for some years and assign gender based on behavior (is this still the case?). Apparently there has been some examination of this woman and her genitals are female. So if she says she identifies as a woman, and her sexual characteristics apparently are female, doesn't that pretty much make her a woman? How does medicine determine gender?