Yeah, I have seen those kind of seats, Jamie-O. Might be useful if I get implants some day; I'm sure that kind of seat would work for everyday riding. However, if I'm knocked out of (and then fall back onto) the seat as I was the other day, I'm not sure if it would help unless I landed just right on the hole. Which has me wondering: what's the chance of implant extrusion if a pair of neo-balls were to be put through that kind of abuse? Something to ask the surgeon...
There are also seats that don't have the 'horn' on them, just the part that you sit your buttocks on. Unfortunately, such a seat doesn't allow you to stabilize yourself from moving (or falling off) side-to-side. Again, another seat meant for easy riding on a street, rather than in the woods with roots, rocks, and exceptionally steep hills. Ah well. Maybe I should spring for a bike with a suspension and shocks after surgery; might help, and it would address my concern that subjecting my rigid frame bike to harsh impacts is going to weaken the frame over time.