It's a really difficult situation that Semenya has sadly found herself in.

This situation only be confined to 'female' sports women, as having too little testosterone or too much eostrogen will have little or no benefit to males in sport.

So it brings into focus the question of what really is gender.

We know there are many cases of people who are classed as hermaphrodites, born with both male and female sex organs.

We know there are many other gender anomalies.

Then there are a lot of grey areas. One of which may be sex hormones that are unusually high naturally, which appears to be the case for Castor Semenya.

So should we determine what should be considered an acceptable upper limit of testosterone for females in sports?