To accommodate the newly-added women, they initially designated the restrooms on alternating floors as "men's" or "women's". But this proved inconvenient (lots of uncomfortable racing up and down stairways late at night).
So the residents took a vote and declared all the restrooms open to both sexes. After an initial period of adjustment, everybody was cool with it. No abuse, no catcalling, no shame, no rape or other atrocities.
The first time I entered the open shower area armed only with a bar of soap and otherwise uncovered, there was a lovely young lady similarly unattired, enjoying her shower. She smiled and said "Hi" and gestured toward one of the other overhead showerheads. I took my shower, which was possibly one of the most distracted showers I ever had.
I was also extremely careful in washing a certain part of my body, lest it become overly indicative of my.... distraction.
After that, everything else was easy.
49 years ago I lived in a student housing co-op that had one bathroom per floor, used by both sexes. The showers were in individual stalls with curtains, and the toilets were in individual stalls with doors. Nobody objected to the arrangement, and I never heard of any abusive incidents during the year I lived there.