There was a lesbian nightclub in St. Paul, Minnesota called the Metro. Nice crowd, good food & drinks, entertaining drag king shows, and lots of gay men went there.
BUT, no men's restrooms. There was a women's, but the men had to use a second one marked Unisex. It did have urinals, unpartitioned right next to the sinks, and so you peed in front of women. Presumably most of them were lesbian, and you just dealt with it. As for the stalls, they all had signs on their doors saying they were not for male urination, to keep the seats clean for the women.
I attended a college in the mid-1970s that had set aside a small, older dorm as co-ed for all floors (the other dorms had alternating male & female floors, there were no gender-specific dorms). You had to be single, never married and between 18 & 25, and your residence of record not closer than 50 miles from campus.
You also were required to take a related course in Adult Living, or some such title, that was held in the dorm's common room nightly twice a week. No tests, but you wrote a paper on your experience at semester's end. I forget how long you could board there, but I think it was only for 1 full school year, 2 semesters.
The 4 floors had only 2 common hall baths on each, and the students on those separate floors voted on the rules of usage for their own level. Their main options were unrestricted access at all times for both men & women, or a sign system on the doors, that said a male or female was inside.
If you were barred for the moment you looked for an open bathroom on another floor. Most often the students voted for the unrestricted option with each new semester, when the issue was again decided.
The showers were the open gang style, so if you were in an unrestricted bathroom you might find yourself showering next to a naked opposite-sex student. Or some floors voted to make just the showers same-sex only, again using a sign system.
Most floors voted to prohibit hallway nudity, or at the bathroom sinks, the way many men are when shaving. The double-occupancy dorm rooms, BTW, were all assigned as same sex.
I thought it was a rather daring concept for the '70s. Anyone else ever heard of this at other campuses, in the US or other countries? Or is this just common practice now?