they make cycling underwear. it's lycra (only thinner) and has an asspad. i wear these with a pair of cargo shorts over them.
back to seats - here's a pretty comprehensive rundown
Sheldon Brown.
I wrote Mr. Brown about the hinged type seat mentioned earlier. Maybe it's because Harris Cyclery doesn't carry them but his response was - "Not recommended. This style keeps coming and going under various names. They give poor lateral stability, and must be set up at a slant, such that you tend to slide forward, and wind up putting more weight on your hands."
Socket4Plug's brother likes his though so they might be worth a try. I'd ask about return policy just in case.