Get a few experts in, listen to what they say, and take their recommendations. If there's a problem, and it sounds like there is, fix it.
I stayed in a University of Tennessee women's dorm once (mixed groups coming in from all over the world over the summer) and they had women's urinals in all the bathrooms. There were no dividers and I can't imagine the mechanics of using one unless the woman were wearing a skirt and no underwear.
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