Why does sex cause UTI's?

Could my boyfriend get a UTI from giving me oral sex? Nurse/physician please help!?

• My boyfriend and I had anal sex and oral (vaginal) sex (unprotected) a month ago which resulted in him getting a UTI. His symptoms began with a very bad sore throat, a kind he had never experienced before and a few days later a burning sensation when he urinated as well as discharge. That makes total sense. He was given antibiotics which he took as directed, the entire course and its probably been close to two weeks since he's finished. This past Friday we had regular, vaginal sex and oral sex as well (unprotected). This morning he woke up with that same unbearable throat pain. Could he possibly have a UTI again? I know it is hard for men to get UTIs in general but considering we did not have anal sex, what could cause it yet another time? Because of the pain in his throat it makes me wonder if something is wrong with me down there because it seems liek the oral sex caused this now and last time. I haven't experienced any symptoms to my knowledge so I'm not sure what is going on. Should I go get checked out? I'm trying to get him to go to the doctor again but he's saying he cannot blow another $400 (no insurance) which I understand. Would the doctor possibly just prescribe antibiotics without seeing him again since it seems like the same thing? NOTE: We have been together for over 5 years now and we have only had sex with one another, so an STD is out of question. When he saw his doctor regarding the former UTI, he was tested for STDs and he was clean. He was diagnosed with a UTI. Thanks!!!

• Answer:

  You can find online doctors which are way more affordable than physical ones. Burning sensation during urination is a sign of infection which can have sexual causes but not only.