I've never seen any gloryholes around my campus, but there's at least one bathroom that's well known for being cruisy, most of them are in general. The way they're set up - all the stalls are separated from the entrance/sink area by a huge L-shaped wall so all the stalls are way in the back and aren't visible unless you go all the way around the wall. I've never gotten up to anything in any of the bathrooms, but considering their reputations, I probably will before long.