Some years ago, I chatted at great length with a couple of young Japanese women. While they were a very small sample, it seems that many Japanese girls women tend to consider enemas a joke, partly because they are very common and a bit embarrassing.
It may be that the Japanese diet, heavy in concentrated carbs from rice, plus Japanese women tend to be skinny, results in constipation. As a consequence, women often carry a mini glycerin enema, called a fig, in their purses and even use them as needed in public bathrooms. Also, I've been told that younger women carry them when going clubbing, just in case they meet someone who they want to hook up with, in prep for anal play
The mini enemas are really very effective, taking seconds to use with results in minutes. They can be taken unobtrusively, even in a public toilet stall with another person sitting 3 feet away, and the person sitting next to you will never know. .You just lean forward, insert the tip, squeeze the little bulb., and wait a few minutes. A strong, complete poo soon happens