I just had two different rolls of toilet paper sitting in my bathroom, and looking at them from the shower I got an epiphany.
Some rolls are soft on both sides, while some only on external one!
And if you have the latter and tend to rip two squares and fold (and it’s easier to fold downside up), if you hang it over you’ll end up with the rough side!
Those people just don’t want to hurt their bums! All while the rest enjoys more easy access to toilet paper while hanging it over.
Endless debate…solved?
Yes, toilet paper. Quite some rolls are more rough on one side - not sandpaper rough, but still enough to potentially cause irritation on the gentle skin adjacent to anus.