Thanks for contacting HCM. I am sorry to hear that you are having erectile dysfunction. From the description of your symptoms it does not sound like your back pain is the cause of your pain. It is possible that you may have low testosterone problems. Sometimes in men that are very healthy and thin that their hormone levels of testosterone are low and need replacement. I recommend that you go to your doctor and have them check you testosterone levels. Another cause is just getting older and having erectile problems. This is common and not usually associated with any disease. Though stress can play a part in ED. I recommend meditation and relaxation exercises. When engaging in sex that you both take your time and don t rush. Also if you drink alcohol or take any drugs then you need to stop. If these measures don t help I would recommend the use of Viagra or Cialis. These medications will allow for better erections and allow you to have sex without worrying about losing your erection during sex. Hope this answers your question. Please contact us again with your health care concerns and questions