Another comment from a Tooth Soap® lover...
Yup! Toilet paper is like the venerable Star Ship Enterprise, both being designed to circle Uranus and wipe out Klingons.
As far as sizing goes, and having raised two daughters, I think that ladies use more toilet paper proportionately, than do gents, so the one roll per month probably depends upon the genders of the two, per two household, too. Besides, it was always the ladies who were squeezing the Charmin more, and more so than they were squeezing Mr. Whipple.
Tooth Soap® Forever was inspired by Charmin Forever. Get your Tooth Soap® Forever HERE.