question: My bum cheeks and coccyx area have been bothering me since last year. I find it difficult to sit for long periods without discomfort and constant shifting. I just feel very tender and sore there. Plus, it hurts when I have sex in the doggy position. I had an x-ray done of my coccyx and lower lumbar area - results were normal. I don t recall having fallen really hard on my bum but I do have a very sedentary lifestyle - I m a student and sit for long periods. Any advice?