@Jenny607 I have no problem with sarcasm, I'm quite a sarcastic person myself. But your sarcastic comment here seems to me to be a reflection of privilege. Not everyone is lucky enough to live somewhere the water comes gushing out of the mains 24/7. Of course I wouldn't allocate a certain amount of toilet paper, but I do indeed ask my guests to be conservative with water, as I receive about 3000 liters of water in any given week. It is only sent down the main to my area once every 5-7 days and I have storage tanks and pumps.
That water conservation awareness includes not just letting the water run when you're brushing your teeth or washing dishs, and refraining from flushing the toilet every time you just have a pee. As I just host a private room in my home, and the guest (I only host 1 at a time) has their own private bathroom, no one has to look at anyone else's pee in the bowl, and not one of my guests, in almost 3 years of hosting, has found this to be in any way strange or disgusting, as the majority of them have been quite environmentally aware people and some tell me they do the same at home. The Mexican nationals understand it easily- many of them are used to living where they don't get water every day.
Even if I didn't have limited water, I happen to think that flushing the toilet every time you have a little tinkle is a horrific waste of water and one of these days, with the way things are going on this planet, it will likely be considered a criminal act.
Of course I don't stand outside the guest's bathroom and listen to make sure they're not flushing a lot or showering excessively. I just make a reasonable request and as my guests have been reasonable people, they haven't minded getting on board at all.