mmm, interesting, but ecuadorian used toilet papers are about 15,5 cms or 6,1” circunference, I think that most girls if not all girls wouldn´t be able to grip that.
As I said before, when I grab it, I would need at least 1,5-2 cms more in my grip to close it completely.
So, as a conclusion I think that most girls wont be able to close the grip between the finger tip of the index and thumb.