[Sister Havana]

Many years ago, IU had what was called "women's hours." All female students had to be back in their dorms or sorority houses by 11pm on weeknights, 1am weekends. (there were no such rules for men) Some of the older dorms that used to be all-female still have doorbells (women who missed curfew were locked out and had to ring the doorbell to get into the dorm, letting everyone know she had missed curfew) It was only in the 70s that coed dorms started becoming more common. This was just one generation ago! Even when I was in school, in the early-mid 90s, many dorm floors still had limited visitation hours, and there were still one male dorm floor and one female dorm floor with closed visitation - no one of the opposite sex allowed on the floor, period, no matter who it was.

At IU, most of the sorority houses have cold dorm sleeping arrangements (rather than individual sleeping rooms) - I can imagine if guys were to sleep there it would be way awkward!