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"Frottage" or "Bustle punching" is the practice of touching or rubbing against the clothed body of another person in a crowd as a means of obtaining sexual gratification.
I know this, because I once rubbed up against Suzy Perry at a pub bar in Dudley.
You have brought back memories of a trip to Morocco in 1971. There were maybe 10 of us late teens to twenties. We left in hurry because of an attempted coup, military on the streets, road blocks etc., and wound up in Algeria.
It was the end of August and the ferries from Algiers to Marseilles were rammed. No option but to go back to Tangiers and home via Spain. You can imagine the queues getting back into a febrile Morocco.
Now one of our number, Chris, was kind of blonde and beautiful once we stopped to think about it. Until that point it had been healthily heterosexual! Anyway, Chris was last in our gaggle and at the back of the passport queue shuffling forward agonisingly slowly. He was a pretty happy go lucky and genial type and strangely stressed by the endless queuing. He was asking to hurry up, maybe swap places and almost getting panicky; not like him at all.
Once clear of passport control he blabbered out of control. Had we seen the tall, skinny Arab in the dishdash just behind him? No mate….. Apparently he’d spent the best part of half an hour feeling this ‘gentleman’s’ arousal and was convinced he’d backed off not because they approached officialdom but because the job was done.
Naturally we were shocked and outraged and grateful for our brown hair and merciless in our teasing but thoroughly appreciative of him taking one for the team. The trip was supposed to be cultural - just not quite that much.