Yes, Japanese porn is weird, but other countries come up with their own weird fetishes as well, so we can't really go around saying Japan is all about porn, it really isn't. In professional and public standings, this kind of topic is very offensive and a lot of Japanese people will refuse to acknowledge it out of disgust because a few holes in the wall ruined their entire image. Just like here in America, Japan has specific places for these kinds of things, some of it is unfortunately more public than it is here, but that's merely because parents get more upset over how public it is here.