I feel badly for Caster Semenya. I suspect that the tests will reveal that he/she has genetic characteristics of both sexes. I doubt that he/she suspected this before, and it is sad that what is a personal and sensitive matter for him/her is being played out in the press.
It happens, I understand, that other things besides X and Y chromosomes can sometimes come into play, bending the development of the person towards the inappropriate sex.
I think you may be correct. I met a young woman who was raised as a boy and blossomed in puberty into a girl... many years ago. She had both genitals at birth and her parents decided to raise her as a Billy, but she turned into a Tracy.
I met her through friends who knew her, at a time when she had been beaten by a boyfriend who found out she was once ‘Billy’.
Horrible to deal with this. It does happen, one would pray that people could try to understand and be helpful rather than critical.