how do you legislate bathrooms and locker rooms if people are discrete in their use of the facilities?The Q angle is determined by DNA and the female hip and bone structure. The same as an anthropologist can tell female and male by bone structure.
If some people want to pretend they are what they are biologically not that's OK buy that doesn't mean they should be allowed to invade the situations that are separated by biology. Such as sports and locker rooms. There can be exceptions for post op. Even post op does not make a man a woman bit they have committed to the pretend enough to to be allowed to use female changing rooms. Sports are a different matter.
Now if it's a single person locker or bathroom then it doesn't matter but shared spaces are different.
Trans is a feeling or more acute a malfunction in the brain not the body the same as other malfunctions of the brain. The real trans anyway with children I think it more environmental as on home life or confusion do to hormone changes. That's why any chemical or surgical changes should not be allowed until reaching 18 years old except in a very small present that are born intersex with both male and female biology. Even then it's a delicate matter determining which is the way to go even for the person.
again, to me, people should be forced to be discrete even in locker rooms. i don't understand people who just walk around naked in locker rooms. don't openly swing your dick around unless someone invites you to do so. and codify THAT in the law.