Thanks for your reply; I am lucky that the antibiotics still work. What my internist did tell me was that eventually they would stop to work. One of the doctors in my internists office told me it did have something to do on how small or thin the woman was. I am only 5'1", and I had my kids via C section. I had a couple of UTI's during the summer just because it was so hot, and it had nothing to do with sex. I have been getting one every two months. I take cranberry pills every day,and I drink a lot.