It's entirely possible that our approach to sexual identity creates scenarios that are ripe for opportunism. (ie the UFC thing) More clearly, just because someone manipulated gender identity to their benefit does not mean that society will not be better off, as a whole, by seeing gender identity as fluid. I guess what I'm saying....a few particular situations and examples should not guide our worldview.

And sports, by their nature, are NEVER 'equal' anyways. Our genes and DNA pre-determine a large majority of it even when gender advantages are neutralized.