Very simple. We dont have any habits to shave pubic hair.
I even didnt know that until my foreign friend from Europe told me....at first I couldn't believe it since we usually dont think its nesessary to do so. We never show our private areas to everyone in public!( only to someome special like bfs, gfs)So we... japanese women dont know that shaving there is very in common outside, you must tell them.In my opinion, japanese women would do so if they are told by their bfs...if they know its better for someone they love. People from abroad must know not shaving is very usual here at least.