I had surgery about 2 years ago to remove a stricture and while I was catheterized I masturbated. I did not think too much about it and the Cather came out about 3 days afterwards. It seems like about 2 years afterwards (perhaps not related) I keep getting these UTI's. I get one about once a month. I am not that sexually active and it could be a month before I masturbate but it seems to have a correlation to when I get the UTI. I just went through a Cystoscopy and they could find no issues. Can you suggest something?