I've travelled an awful lot but nut never had anyone masturbate next to me
I believe there was such activity in the row in front of me on a flight between Amsterdam and Manchester earlier this year. It all seemed to be managed quietly and effectively by the KLM crew. Seats elsewhere were found for the unfortunate couple sitting next to the miscreant, who appeared to be spoken to severely by the crew and was held back when the rest of us disembarked.