sorry to post this but try riding sans pants. You'll find it liberating :)
I have a Specialized seat that is pretty good and I don't wear padded knicks (I wear baggy jogging shorts and have developed a hard arse!).
A quick look in a website - it might be sonoma gel recreational.
My saddle is a Serfas split saddle with padding. So I can wear baggy shorts without padding, or tracksuits in winter. My clothing suits utility cycling, and I wear the same clothes when I do other cycling. In fact, I now wear the same 'cycling' clothes all the time, because I do many short utility rides.
It only happens on my roadie and not on my hybrid, so I sure it's the seat but thanks for the advice.
Old school suspended leather Brooks saddles are comfy...