I have never (thankfully) been the victim of any kind of abuse, sexual, physical, psychological, from a man or a woman. I have had a complicated birth in a hospital which, at the time, had restricted visiting hours. I don't think any woman should have to explain herself to hospital staff as to why she doesn't want to be in a ward with strangers who are non-patients. I just don't feel comfortable with it, that's my reason. And it should be good enough. If separate facilities were made available for abuse victims, I could make something up. Or I could pretend to have religious reasons as to why sharing a room overnight with strange men was something I didn't want. But doing either of those things would be inappropriate. Until facilities are made suitable for 24 hour visitors - private rooms, walls, increased numbers of toilets and showers - the rule of no should apply because some (most, going by this thread) wouldn't like it.
Thankfully (sort of) I'm likely to have a complicated birth and so will be near top priority for a private room. So hopefully I won't have to put up with it.