In some countries, finding a public toilet/WC may be easy (as in China, France, New Zealand, or Australia), or virtually impossible (as in the USA or Italy).
Where a country lacks public toilets, locals probably expect that visitors will follow their own example, and use an establishment such as a bar or café. However, in popular tourist destinations, grim faced waiters and grimmer signs, or locked doors, provide a strong disincentive to anyone seeking relief without becoming an involuntary customer. In smaller villages and localities, there may be no such prospect at all. Is it possible that locals in those countries have developed a Darwinian survival trait that allows them to better control their bodily functions?
Most public toilets make no concessions to aesthetics. Not so this one in Pont Aven, Brittany; my selection for the most beautiful public toilet in the world. Why? It’s an elegant structure, reminiscent of the hórreos or granaries of Galicia in Spain. Traditional stone construction integrates subtly with the convenient central location in the village, and the Aven River below provides soothing sound effects of running water.