These are the two concerns I have. Maybe a highschool boy does identify as female. I highly doubt he has had reassignment surgery at such a young age. That being said, my 14 year old daughter shouldn't have to see his member in the locker room shower even though she is perfectly safe. Also, I worry about the girl who decides to exercise this right by using the boy's bathroom or locker room. Thinking she is "one of the guys" can be really unsafe for her, considering how often a group of young people together can result in really poor decision making. A single non-gendered bathroom with shower seems like such a better option to me, as I realize it can be bad for a male who identifies as female to use the boys bathroom as well, due to bullying.