Do I have urethritis or something else?

My boyfriend has had pain during urination and ejaculation. We have been only with each other for the past year and neither of us have STIs. The info I have found on the internet makes me believe maybe he has urethritis. My question is, can you cause damage to the urethra during oral sex? I don't want to get too personal, so I will leave it alone, but I want to know, can you cause damage due to any force to the urethral opening?