The only kind of males and females are biological males and females. That's the crux of the issue here. What is of grave concern to the "transgender rights" crowd is what the denial of accommodation logically entails which is that "Jennifer", for example, is a man and it isn't fair that "Jennifer" compete with females. It directly confronts transgender make believe with an unwelcome reality. I might only add that this is a fantasy world many of you are foolish enough to indulge while simultaneously arguing that transgenders have no place in women's sports.