About Japanese Toilets
Japanese toilets run the gamut from flushable holes in the ground (like the one I had to use the other day to provide a specimen for a medical screening) to singing, heated, deodorizing, behind-washing marvels that make TP all but unnecessary.
Sometimes toilet controls will be labeled in English along with the Japanese, but many of them don’t. And the control panels appear in different forms as well, so icons vary by model.
As anywhere else in the world, men don’t worry so much, but Japanese women especially don’t want anyone hear them do anything as gross as pee or poop. That’s what the music or white noise is for. Different toilets offer different sounds. Behind washers come with weak to strong water pressure. There are different buttons for men and for women. Different plumbing, different squirts. You press the red button to stop the spray or get everything within feet of the toilet wet. Some models even offer a dry function.
Then it’s time to flush. Almost all Japanese toilets have two flushes: one small (to save water) and one big for when saving water is not your top priority. The small flush doesn’t work on the toilet in my apartment, so I’ll find out soon how much higher my water bill is going to be than my neighbors, who have working big flushes.
As you step away from the toilet, some of the most modern lower the lid for you and then open the lid for the next person who approaches.
Since the 80s, when sit down toilets began to become popular, there have been instructions on how to use the toilets. Here is the original set of instructions still on my toilet paper dispenser since the 1980s, when this apartment was built:
Nowadays some of the older toilets still have instructions in English, like this one I saw in a department store recently.
pedestrianorthodox 
Great post! Did you lady push the button?