Going off at a tangent from the headline:
My parents, who were very conscious of the link between childhood misbehavior and constipation, had a routine where, during or (mostly) immediately after the bare-bottom spanking, they would insert a laxative suppository. To tackle the root of the problem – and because the suppository was the real punishment: they knew my sister and I feared and resented “anal penetrations” a hundred times more than any spanking.
Not whilst being spanked, but I do remember something similar. I had done it in my pants on the way back to the care home after school. One of the carers asked if I had messed myself, which I denied (as usual). She knew otherwise and marched me off to the bathroom, pulled my trousers and pants down and shouted at me that I was old enough to use the toilet when I needed to. She then made me bend over and began to wipe my bottom so hard that it made me finish what I’d started to do in my pants – right into the toilet paper in her hand. To say she went mad at me would be an understatement.