Is that seriously any different than walking all the way up one flight of stairs to the girls' floor? Or even walking the whole 50 feet to the girls' dorm in the next building?
I think you're making a little bit of a artifical distinction here. In single-sex dorms, maybe the girls aren't right across the hall, but it ain't like they're far away. Heck, in my single-sex dorm, I saw more than my fair share of unclad women in our shower.