I was wondering if yichud is an issue in a situation like one that might arise on a college campus in an all girls dorm (apartment style- the building is mixed but each apartment is separate) if one night a guy sleeps over.
Dorm apartments are public enough that if the front door isnt locked chances are people will walk in freely during the day but in the end of the day they are real apartments not dorm rooms off a hallway.
My question is if in this situation there is a yichud issue? And if there is one if the fact that the girls out number the guy (6-1) helps and if not locking the front door would be enough to avoid a yichud issue or alternatively if locking yourself in your own rooms helps?
I'm looking for a general answer on the matter - the basic rules for yichud and ways of dealing with it and I'm sure many of you have thought about it in the context of a dorm situation at some point. Thankfully this is not an actual issue for me right now but its good information to have.