Gender row athlete: What is intersexuality?

The case of South African athlete Caster Semenya has sparked worldwide interest following reports that she will be tested by sporting officials to determine whether she is male or female. ...the IAAF are testing to see whether Semenya has a rare genetic disorder that means she has female genitalia but male chromosomes.
Check out Intersexuality and How Sex is Determined for the genetic explanation of XY females.

The default of all human beings is female
"If you are insensitive to androgens, you will grow up looking like a girl because the default of all human beings is female. However if the body, when it's developing, is not guided into turning into a male, then it will always be female."

Caster Semenya: Intersection of Intersexuality and Eunuchs
For more than half a century it was common for doctors to carry out reversal operations, either through castration [known as castrated Eunuchs, check out Eunuchs of the Sun (Jesus on Homosexuality and the Third Gender and Eunuchs, Hijras, the Third Gender and the Bible] or constructing a new vagina, on babies whose genitals were seen as either too big or too small.