We discussed this some time ago, but I think the point has fallen by the wayside.
It is natural for females of the species homo sapiens to seek to limit or curate those males who are allowed to see them in a state of undress, or those males whose bodies they see in a state of undress. You can call it modesty, you can call it agency, you can call it bodily autonomy, you can call it consent, whatever you like.
Whatever you call it, it is about whether the female has control over which male or males she accepts in a potentially sexual situation. Changing rooms, sleeping accommodation, sanitary facilities and so on are proxies for potentially sexual situations, because these are places where the people using them are or are likely to be in a state of undress. Seeing an unwanted male's genitalia, or having an unwanted male see your genitalia, is stressful, embarrassing and a cause of acute anxiety - maybe not to every woman, but to a great many. This is completely separate from whether or not that male has any intention of doing more than expose himself and look at the view.
When women and girls are told, no you have no right not to be exposed to the sight of an unwanted male person's genitalia, and no, you have no right to be able to prevent an unwanted male person seeing more of your body than you want him to see, this transfers control over the potentially sexual situation away from the woman and on to the man who is insisting that she must look at him and he must be allowed to look at her. The social norms that allow women to choose which men see them in an intimate situation have been swept away.
The law accepts, or at least it used to accept, that women should not be subjected to the sight of male genitals they don't want to see. That's why we have the offence of indecent exposure. The law understood that women's modesty and dignity and peace of mind require that they choose which males they want to enter into an intimate situation with, and that they should not be forced there against their will.
This is the fundamental point, far more so than "She might rape you with her penis, you bigot!" It's not all right for a man to force the sight of his genitals on a woman who doesn't want to see them, even if he has absolutely no intention of laying a finger (or other body part) on her.