Answer: There could be several reasons why a person experiences frequent urinary tract infections after sex and the best and first recommendation is for you and your partner to get tested to ensure they are in fact UTIs. A lot of STIs can cause symptoms that mimic UTIs as well. If a physician does diagnosis you with a UTI, antibiotics are the best course of action. In effort of preventing more in the future, try to urinate immediately after sex and increase your daily water intake. Further discussion with your physician may offer other options that would be effective for you.