You point something out that could also 'maybe' be an issue that no one is talking about...except you. Get out and ride. Get yourself and your butt, literally, in shape. I'm not sure by what you say if you are talking saddle sores as they are standardly thought of or if you are talking just having a sore butt because you don't have enough saddle time to get the butt muscles use to riding and having a saddle stuck up your butt.