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As the article on Wikipedia above says, it is a real problem in Japan. When I worked there, the women that I knew were genuinely worried about going on the tube because of it.
Of course, it would! No one is going to like being touched by a stranger without their consent, would they? Frotteurism is a mental disorder; one of the twisted ways of imposing one's sexual fantasies on someone else.
I remember seeing an interview with Moby where he said that his entourage entertain themselves at vapid celebrity functions by '**** rubbing' and he was proud to say that he'd 'got' Xtina Haguilera.
Insert two fingers, three if it is a big one.... make sure it is nice and wet, then move your fingers in and out and rub gently...... and that's how to wash a dirty cup! tsk if you were thinking of anything else.