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The other possible causes of urethritis apart from chlamydia and gonorrhoea are either E.coli, Mycoplasma urethrae or Ureoplasma urealyticum. All these organisms are harbored in the urethra and if the recipient ( No.1)of oral sex harbors them , then they can transfer it to the partner( No. 2) who is giving oral sex to him or her.
Now the infection once transferred to the second partner ( No.2), if he or she has oral sex with another fresh partner ( No.3), then No. 2 can transfer these infections to the No.3 partner causing urethritis.
So, thats the cycle for oral spread of infection.
I hope i have addressed your concerns,
wishing you good health,
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