I know I was in first grade (6 years old?) when I discovered it by chance. I had been with friends and trying to "shinny" up a street sign pole and, out of the clear blue sky, pow! I held on to the top of the sign for a moment then slid down to go pee in nearby bushes. I am sure it was just dry-firing, but for some reason, afterwards, I would always go to the nearby bushes to pee. Perhaps, who knows, this is why I equate orgasms with omorashi?