As a girl I felt awkward and embarrassed about managing sanpro in toilets, that were single sex female! I would have rather bled on stuff than go into a space where there were men and boys.
Same with breastfeeding when I've not been able to escape without giving a quick topup feed. I would not be comfortable for men and boys to be there (teen boys and older i mean).
I have had to use tampon dispensers in public loos, again not something I would do in front of men and boys.
I am comfortable with other women seeing me buy sanpro and take it into the loo, noones interested! There's no sexual interest.
With overtly practised fetishes on the rise and being pushed on women, and used tampons and pads being 'taken for personal use' and cameras placed behind toilets now being a thing, and upskirting, NO, men and boys stay out of women and girls private spaces.
I have seen pics on the internet of women secretly filmed in toilets, of men doing selfies boasting that they're in a womens loo, these men need to be kept out, and a single room for mixed sex use creates risk for women.
As men can more easily lock in one woman or child, by waiting inside or loitering outside and pushing them in.
Everything about it is wrong and unprotective of women.