Thanks for your question, and I am sorry to hear about your problem. Back pain in any setting is uncomfortable, but it may be that it is especially annoying when it intervenes at times when it is less wanted. Now, your question provides some clues. First, the fact that your problem has only started in the last few months despite having been together for some time suggests that there may be something new that needs to be addressed with your doctor
. Sexually transmitted diseases are one possibility, and it is good that you have been tested already. Your doctor will likely also ask about if there are any specific actions that replicate the pain, or is the pain only after the orgasm itself. This is because different pain receptors are present and could potentially become involved during coitus. If you experience the pain only after the orgasm, then it could be a neurologic problem involving how the act of climax affects the nervous system. Given that there are many different options, and that your symptoms are new, it is important to discuss this with your doctor. Your OB/GYN or your primary care doctor
would both be able to help. Please speak with your doctor.