Japan, with its huge press of people, has a very high level of complaints from women about the liberties some men have taken in the train cars.[1] Predictably, some men are complaining, but I really do not see another viable solution, given the press. They could institute lower maximum occupancies, but they would have a very hard time enforcing them, it would basically require someone standing at each door letting people in and out slowly enough that they could be counted. In other words, it would slow down service incredibly, raise prices (wages cost), and lower the total capacity. So as I was saying, I really do not see a way around this. Of course, this totally flies in the face of men and women being identical. ☺
[1] http://www.reuters.com/newsArticle.jhtml?storyID=8422026&type=entertainmentNews