It's interesting that you mention postnatal wards. We tend to think of "vulnerable" women in hospital as those who are elderly and/or sick.
My hospital introduced overnight stay permits for partners on our postnatal ward several years ago. We provide reclining chairs for the partner, and they are absolutely not permitted to use the patients' toilet or bathroom facilities, they can use the public toilets, and they need to go home to wash and change etc, this applies to partners of either sex (some women have their mum or sister with them, and of course, we have female partners staying too)
The new mums like having their partners there, but inevitably, we have had problems with men using the toilets and showers, men being aggressive when challenged on their behaviour, and with men generally being loud and annoying on the ward. There have been instances of men trying to take their baby away from the mother because their mother (baby's grandmother) can "look after it at home". We have had two men arguing over paternity, we've had men walking around in their underpants, or topless.
When it was first introduced, I protested strongly to anyone who would listen*. I have always thought, and still do, that women on a postnatal ward should not have to continuously have to share their space with men who are strangers to them. These are women who are, or have been unwell during or after their delivery, or who have had surgery, possibly of an extremely intimate nature. It's fine for men to come in during visiting hours, but I don't think it's appropriate to have them there all day and night.
*Not that anyone did. They had to listen to Covid though