In reference to the comments about dick swinging in changing rooms, and some men just being disgusting ...
I work in a heavily male dominated manufacturing environment. There are some men who work there who are notorious creeps towards the women. A subset of these men are also considered threatening by the men who have to get changed with them, precisely because they like waving their cocks around. They're even sexually harassing other men!
I'm not sure what exactly I want to express here if I'm honest, except there is something badly wrong with some men, and they should not be allowed to share private spaces with women. If men with their relatively equal musculature feel threatened, women are definitely vulnerable. To try to deny that such men exist, or that the wouldn't try "But I'm a woman" to invade spaces where they shouldn't be just beggars belief.
This is exactly what PP have been referencing regarding safeguarding. The risk that any man is a threat should bar all men from female dedicated spaces. And if what my male colleagues say is true, we might need special changing rooms for universal creeps, where the users are selected by private polling.