You may want to visit your minister or rabbi. A severely stinky ass often is a sure sign that a demon has taken up residence inside your digestive system. Demonic possession is frequently accompanied by sulfurous and extremely odiferous anal discharges that often are not accompanied by any noticeable solid discharge or liquid effluent.

Your abstenance from sex is an admirable way to avoid taking on any additional ass-stanky demons; however, you're most likely gonna have to get some professional and highly experienced help to exorcize the little demon you're currently hosting.

Good luck, and Peace in the Poopchute.