Good question! I just bought a new road bike and have been looking at after market seats. The newer designs are a bit wider, have more cushioning, and have a depression in the center of the seat that is supposed to relieve the pressure on the peritoneum (sp?). I plan to ride at least ten miles per day over the summer. I am trying to lose the fat from ADT.
It will be interesting to read the replies.
By the way I did some research about PCa and bike riding and most said there was no link. A few years ago there was some buzz to the contrary.