Whilegropingand ogling happen in every country and culture, I think in many Muslim countries, it can sometimes be a bit worse because if a wwoman is groped or leered at, she is usually blamed for it. She was dressed too provocatively, or she acted provocatively...you get the picture. Its easier for the guys to get away with it.
That said, its happened to me here in the US. Crowded subways attract perverts like a magnet. If a perv started getting too close to me, I'd look around to catch someones eye and say "Pervert alert!" then glare at and move away from the perv. That would usually cause the perv to exit the car at the next stop. If I was too slow in detecting their move, I'd place the pointy heel of my shoe on top of the perv's foot and shift my weight onto it. "oops....I'm SO sorry about that"
ouch. Placing the pointy heel on perv's foot was literal, right?