You have got to be kidding me. While it is prevalent on the subway system here, the enacting of this law would be uneven to say the least.
That's before you get to the women who actually initiate and continue this "bumping inconsistent with the motion of the train" business. I've had chicks grind on ME with my hands on the rails above, being sure to not grope or the appearance of doing so. No one says anything about THAT though, do they?