There are alternatives to TP, but the only one I really want to use are sold in the drugstore as wipes.

If you need to sample the leaves to see which ones give you rashes or not, then you do it. But when the urge strikes in the middle of someplace with facilities and you have not had time to prepare, that roll of TP or package of wipes is wonderful to have.

After TEOTWAKI, I'll learn to use leaves, etc. Right now, I want the modern convenience.