Being born a man is natural too. Why do we not let men, who have a natural physical advantage, compete against women in sports? It would mean the end of womens sports (for many sports at least) just due to the natural strength and muscle mass advantages men have. So why should a person with those same advantages be allowed to compete with women in sports? There should be a category for trans or intersex athletes if fairness for all (women and trans) is to be continued.