Comment by morninglight

One advanced civilization has tens of thousand of free public toilets.

https://lazyholidayplanner.com/essential-tools/japan-toilet-...

https://www.cnn.com/travel/gallery/japanese-public-toilet-ph...

https://www.toilet-map-jp.com/en

https://toiletrix.org/toilets/japan

https://commons.wikimedia.org/wiki/Category:Public_toilets_i...