Curiosity only.
Here in Brazil it’s very common to have several showers a day. I, for example, take two. The first is when I wake up, before I go to work, and the second is when I get home from work. I wake up at 6.30am and get home at 8pm.
edit: I said bath, but I meant shower.
I would suspect a correlation more with climate. If it’s temperate, you don’t shower as much as when you’re hot and sweaty all the time.
Also, geothermal power exists.
I was gonna say with the prevelance of air conditioning. In warmer places that have ample water supply but little AC, i would expect more showers as people sweat throughout the day and don’t want to be stinky.
I shower once a day in the morning, but i almost never sweat because im almost always in the AC.
Hot water is also a waste byproduct of nuclear power generation. There are whole towns that use nuclear heated water to warm their houses and for hot water. It’s used quite a bit in Russia and china already
https://www.powermag.com/district-heating-supply-from-nuclear-power-plants/
Interesting! I didn’t know that, but it makes sense.