Coal miner
When I was 16/17 I worked as a trainee electrician in the coal industry in a small colliery in the South Yorkshire coalfield. I, along with other young lads had to complete a 3 month basic training and safety course underground in one of the biggest collieries.
We actually saw a couple of miners working naked , i soon joined in. On that occasion we were taken to the pit face, where the heat was unbearable, and two young men were totally naked, wearing only helmet, knee pads and boots. The large bladed machine that dug the coal from the face made the loudest noise I had ever heard, and kept travelling past us as we crawled along the pit face down a tunnel about 18 inches high at the side of the machine. It was quite a long tunnel, and I was directly behind one of the young miners as his balls and arse swung from side to side. Gave me a huge hard on lol
I always enjoyed the showers in the pit head baths, I found some of the other young miners really sexy.