[harveychess]

If you try to define athletic divisions by sex, you're going to have a hard time. The world's best athletes probably all have some unusual biology. About 1.7% of people are not completely biological male or female. I would expect that proportion to be higher for Olympic athletes. Excluding 1.7% or 2% or 10% of the world's best athletes from competing would not be fair.

[zeven7]

Anybody can compete in the unsexed category. It’s only the female sex category where someone can be barred. No one is barred from competing at the highest level.