In reply to TobyA:
> Absolutely, but then surely it's not so different from other genetic advantages some athletes have over others?
The difference is that we have protected women-only events precisely to isolate them from competition with men who, owing to testosterone, are bigger, stronger and faster. That's why the genetic advantage of extra testosterone disqualifies you.
We don't have protected categories of basketball for people under 5ft8, but if we did then the genetic advantage of extra height would disqualify you.
We don't have protected categories of sport for people from poorer countries with little coaching and few facilities, but if we did then the advantage of being from a rich country would disqualify you.
We **do** have protected categories in boxing, judo, etc, for people under certain weight limits, and there the advantage of extra weight does disqualify you.
We also have protected categories for kids under a certain age, and for those the advantage of being older and bigger disqualifies you.
So sport has to decide: do they want protected women-only categories, where too much testosterone disqualifies you?, or not?
If we decide that women don't need protecting from too much testosterone, then let's have open mixed events only. In which case no woman would ever win anything again.