Why would it be worth doing any sort of study? To do such a study you would have to find some sadistic researchers (likely divorced women) and a large group of masochistic men. The first group would be easy to find, the second not so much.
Yes it hurts. The lower they descend the more it hurts.
But you can get just as painful a result in other ways.
- Sitting down in a small toilet seat (large = 17 inches or more, small – 14”) and not watching to make sure the testicles clear the rim.
- Having your pants – jeans ride up too high and squeezing
- sliding down a bannister in an unbalanced way.