STD FROM TRANSPERSON
Urethritis is an irritation of the urethra -- the tube can carries urine and cum thru the penis. Urethritis can be caused by many different germs and some well known ones like gonorrhea and chlamydia. NGU is short for non-gonococchal urethritis, or urethritis caused by germs other than gonorrhea.
Using a condom during oral sex should greatly lower the chance of getting any germs into the urethra. It is also very common for people who go outside their relationship for sex to get symptoms and think they have an STD. While we can never say for sure that there is no STD, anxiety and stress can produce a very similar irritation. Only a doctor can tell the difference during a check-up.
Since you are sexually active with more than one partner, I would suggest routine STD screening every three to six months. It will also help settle your nerves because you can be more sure about your STD and HIV status. The risks you know will help you make informed choices.
To your health,
ORAL SEX ADVICE