Ah yes, the good ol student union bathroom! My school actually didn’t have one bathroom that was really cruisy, they were pretty well distributed. The bathroom stalls in the general classroom building where most of the classes were held served as the “personals” in the pre-Internet days. On the walls and doors of the stalls guys would write their numbers or the locations of gloryholes/full penetration stalls in various restrooms across campus and/or the days and times they would be there.
The bathroom in the bottom of the student union was the one with the most action (but physics building and mid-library were almost as good). There had to be some unwritten rule that everyone knew about because you almost never saw girls going into the women’s restroom down there. Also custodians never bothered to repair the gloryholes, only half-heartedly put duct tape strips on one side of the hole that really just served as a sturdy flap. Great memories!