Answer: Showers

Japanese consumers love their cellphones, and among them nobody loves their phones more than young Japanese women. They use their phones so extensively that their usage patterns drive major trends in the Japanese mobile phone industry.

One offshoot of this is that, unlike Western markets, almost every phone sold in Japan is waterproof, as the ability to take your phone safely into the shower or bath is highly valued by the young women who cannot bear to be parted from their mobile devices.