Thanks for all the responses. The perineum is an artery that allows blood to flow to the "unit" right? Blocking that blood flow can lead to the numbness right? Maybe that has little to do with the prostate, I am not sure.
Tom said that the saddle bows in the middle a tad, easing pressure. I had it in my head that the idea was to take ALL pressure off the middle area, and put it all on the sit bones? Do I not understand this correctly?