It all depends on what you call a crime doesn't it Biggles? If no-one reports being sexually assaulted in public by strangers then it won't show up in crime figures, if it's even illegal to do that - I don't know. I certainly think women in both China and Japan are getting wise to being treated like shit, which can be quite annoying even if you're not the victim of a crime.
That is true - isn't it the case that the number of assaults reported in the UK is tiny in comparison to the suspected total number? I would imagine that is the same in many countries. Not sure about China but certainly in Japan "sisters are doing it for themselves" (or with an octopus) and traditional views on home and work are breaking down.