I actually know nothing about it, but because I’m curious to hear your response, I’ll say “I hereby argue that the policy violates the Equal Protection Clause.”
Your response would then be that it it does/doesn’t because…
When I visited my girlfriend (at the time) at her all-girls school, there were signs kept near the bathroom door with some cutesy clip-art (I believe a caricature of a circus strongman) and the phrase “MAN IN THE CAN” which one was to hang on the bathroom door if one’s male overnight guest were using the showers or toilets.
Given the culture implied, I doubt it will come as any surprise that it didn’t seem to stop people coming in, which is arguably just as weird for the band geek trying to shower in a girl’s dorm.
Well, I went to a catholic university in the 00s and the rules were no opposite sex people in the dorms after 12 on school nights and 2 on the weekend. The interesting thing was that on-campus apartments had 24 hour visitation, but no sleeping. If for some reason the RA stopped by at 3 in the morning, John and Jane better be playing parcheesi, not that anyone ever stopped by.
The few same sex couples I knew of usually ended up just rooming with each other.