If it’s your first visit to Japan, you might be put off visiting an onsen because you are not sure of the correct practices or etiquette. Don’t be. Onsens are casual places for Japanese people, and once you have a grasp of the basics you’ll fit in perfectly.
It’s a source of real irritation to me that, no matter how much you spend in an Australian shop, no matter how high-end, the likely greeting by the shop assistant at the till will be “Just these today?”. Once I was shopping for a whole new work wardrobe, assisted by a personal shopper. Even with the personal shopper’s discount my bill in one shop was a comfortable four-figure number. “Just those today?”, I was asked as I approached the counter. I almost asked whether she would prefer I shop a little harder just to gain her acknowledgement as a bona fide customer.