Japan is serious about stopping train-groping. They’re even putting up cameras to catch pervs in the act:

BBC Article

It sounds kind of silly but I guess it must be bad if there are websites where gropers swap recommendations on the best lines to feel up commuters.

More than 6,000 people were arrested last year on suspicion of groping or taking unsolicited photographs.

Several suspects arrested in recent months are said to have told officers they had targeted particular train lines because of recommendations they had read on websites.