Lori, Here is one rule presented to us by the Dean of Women at the teacher's college I attended in the early 1960s when we finally got a darkroom. I am not making this up. "At least three students in the darkroom at all times; two must be of the same gender."
Sounds like a rule the advisor of one school paper I worked at (not saying which) imposed in the 1990s! They don't have a darkroom anymore though.