Using the toilet in a foreign country can be quite an adventure. Standards of hygiene can vary enormously from one country to another and what is considered to be etiquette in one country is quite the faux pas in another. What to do with toilet paper, for example. I am British and we wipe, drop in the bowl and flush. This is the same in Japan too, but Japan's neighbours, Taiwan and South Korea, wipe and discard in the bin provided. This has something to do with the standard of the toilet paper. Taiwanese and South Korean toilet paper is too robust to dissolve in the toilet. Flushing away results in blocked toilets, so, in the bin it goes.
Takachiho, where I live, is a tourist town. Many visitors from all over Japan, Asia and beyond, visit the gorges, waterfalls and shrines in our neighbourhood. As well as visiting all the sights, these tourists also visit the public conveniences.
One of the ladies of our temple congregation works as a toilet cleaner. She says the corner bins normally used for disposing of ladies sanitary products are overflowing with soiled toilet paper most days. In the Gents' it's worse, having no sanitary napkin disposal box, the pile of pooed and peed-on paper spreads all over. It's a cultural difference which could lead to friction between locals and tourists. I have seen notices in several languages telling people to flush toilet paper in the public toilets at expressway service stations, but still not seen them in the toilets in town here.