Davidhs When it comes to testosterone levels we already have restrictions, the South African runner has been limited to her events so if sex change athletes are an issue the limits are already there.
If you watch the Navratilova documentary to which I posted a link earlier, you will realise that tests and science show that Caster Semenya, the SA runner, still has way more testosterone than a female runner, even though she has been told to reduce the level. Navratilova allowed her own testosterone level to be measured against male athletes and against trans athletes, and it is not a level playing field.
I don't see why there can't be a separate athletic category for trans people like there is for people with physical disabilities. No one expects a swimmer with only one arm to compete against able-bodied swimmers, and no one should expect women to compete against trans athletes.
No doubt I have said something to offend somebody, but that is really not my intention and apologies in advance if I have done this/used the wrong terms/upset anyone.