It’s gets super convoluted at that point. Men and women who have switched genders by way of hormones is an easy solution. You can have the same league levels as we do now, not have to make up a whole bunch of new ones, and you keep women’s sports for assigned at birth

To be clear, mens sports are usually open sports, they started being called men sports when women had to open up their own, but I think anyone can partake. They don’t, because they lose, and it makes it not fun. So open categories aren’t an answer. But a hormone competitions are a great one. :)