That says it all - it takes me about a month in the early season to get toughened up again. Is this a new bike for you? If so - you may have a poor saddle on it. Picking a saddle is hard and there is no formula I know of - it is a lot of trial and error to find a style that works for you. I can tell you one thing - bike shorts with a wad of padding is not the answer, the right saddle adjusted properly is the answer and enough time in it to toughen up. Now I'll wait for the Brooks recommendations...