[Publius Valerius]

I will never send my kids to any college with co-ed dorms

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.

[Antoninus]

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?

Notice I said "dorms" not "floors." And it is different if they have a door monitor, and you have to sign in before you can go into the girls' dorm, and they keep track to make sure no one is "sleeping over." It's a huge difference. My brother had girls living across the hall from him at University of Delaware. The first time I went to visit him, there were girls in their underwear flouncing about in the halls. Talk about "near occasion of sin." My parents should have pulled him out right there.