All I know is that we had five kids in the family and at one time or another (cause we always switched rooms) we all shared rooms, 4 bedrooms, five kids, and parents the rule was that the oldest got their own room. I never had any worries or thought of doing bad things or any of my brothers or sister doing anything to me. Wow, I never thought this would be a discussion. My son and daughter won't share a room because they don't really have to, but if they had to, I would not worry whether it was right or wrong, and I don't think they would either. I would mostly be worried that they would strangle each other. Or bicker themselves to death. Hahaha
