Originally Posted By: HowlerKarma
The institutions themselves are not so keen on it either, because they have none of the authority (can't act in loco parentis even if everyone wishes they could) but all of the culpability if something goes WRONG.

Many universities used to have separate dorms for males and females and had restrictions on visiting hours. There are probably some with religious affiliations that still do. Changes in dorm rules reflect changes in the social views of the institutions and their students.