(Epic self-bump of 3 year old thread, but not sure this warrants a new thread - apols if I'm wrong, mods)
Update from Wired.com https://www.wired.co.uk/article/caster-semenya-testosterone-ruling-gender-science-analysis
The Court of Arbitration for Sport (CAS) has rejected an appeal by South African middle-distance runner Caster Semenya against new athletics regulations that set an upper limit for testosterone in certain women’s events. From now on women who want to compete in international competitions at distances of between 400 meters and one mile will have to reduce their blood testosterone level to below five nanomoles per litre for at least six months before the event, and then keep it there. For Semenya, the double Olympic and triple World 800m champion, it is a crushing blow.Lots more detail in the article, but the fact that no recent articles are mentioning is that this competitor doesn't just have high levels of testosterone -
SHE HAS A SET OF FULLY-FUNCTIONING TESTICLES!! (albeit internal)

Surely this needs to come down to biology - i.e. your fixed-for-life XX and XY chromosomes - and not gender...?
UK Female swimmer Sharon Davies:
“Caster’s case highlights what happens if athletes born with male characteristics and a Y chromosome compete in female sport.
“If we are not careful then in 10 years all the records in men’s sport will be held by men and all the records in women’s sport will be held by women who carry a Y chromosome. I think we need to look into reclassifying things.”
She continued: “Maybe we have an XX female category and then a category for men and XY. We want sport to be inclusive and perhaps the way to do this is based on biology.”