Hi. Thanks for your query. Noted the history and understood your concerns. Since HIV and other STDs are negative your unprotected sex has nothing to do with your loose stool propblwms. You are having the problem for such a long time. Although has enhanced since three months. The most probable causes can be: IBS that is irritable bowel syndrome. Inflammatory lesions in intestines or nearby like lymph nodes. This can be diagnosed by tests of sttol, blood and urine as a routine. CT scan of the abdomen Colonoscopy. Any other tests as may be dectated by clinical evaluation by a Doctor. If all the tests are negative means this is IBS. If anything is found during the investigations, get it treated accordingly. Control the stress and anxiety and stop the foods and beverages that enhance the problems.