The argument of sexual assault is made to drive fear, as the nuances of this issue are very complex.
Case in point. One of the barristas at the Starbucks I go, in dress, style and mannerisms, is fairly butch. One day I noticed her name tag is now a male name, along with a pin explaining to customers what pronouns are now acceptable to him.
Out of respect for him, I call him by his preferred name, using the pronouns deemed acceptible by him.
That is just simple decency as his identity has zero impact on me. Over time, he has grown facial hair and his voice is starting to deepen. He also apparently works out quite a bit because he has bigger guns than me.
Now I can respect this person. I can share a bathroom with this person. We both work out. I can even share a dressing room with this person.
But he doesn't have a penis.
In a gym locker room scenario, it is going to be fairly obvious that anatomically one of these men is not like the other, and it is at a societal level far deeper than just race or skin pigmentation.
Take sexual attraction out of the equation because it is irrelevant. At this stage in our societal progressive evolution, why not just go full Starship Troopers. If we are going to embrace this notion of there being an identity spectrum, why not tear down all the identity based artificial walls? That means coed college dorms. No more fraternities or sororities. No more gender based bathrooms or dressing rooms. All beaches are now nude beaches. Let's just let it all hang out.