Groping in Tokyo.

I've always known that groping was a problem in trains in Tokyo. Speaking with lots of Japanese women confirms that many of them have been groped on crowded trains and many of them do not report these incidents or find the offenders. A male Japanese friend once told me to keep my hands up in the air when riding crowded trains so as not to be blamed as a groper. There are women only cars running during rush hour but none for only men. I wonder if there were men only cars, would people like my paranoid friend who would use them so they could rest easy with their hands in their pockets- even during rush hour. Anyway, the ABC did an interesting, albeit brief, story on this very issue.