my experience tells me its helpful to pull down your pants before you fart
You're probably wearing the same pair too often. I frequently wear-out work pants like this because they don't get as much of a break in-between being worn.
I recently saw on tv an older gentleman in his 50s who had a hundred pound tumor coming from his testicles. It was really sad, because he was already severely overweight. He wasn't able to drive obviously, affected his ability to get a decent job, and basically had to lift his tumor just to sit down on the bus. I really can't imagine what that would do to someones ability to leave the house. Pretty amazing actually.