I would just like to stay up to date with the most current information regarding oral sex. I have seen where you both state that oral sex is safe sex, not free but low transmission rates. Would unprotected oral sex be placed in a similar safety category as protected vaginal sex? I have seen some published articles stating that pharyngeal chlamydia is found in 1.7% of people- would you agree with this statement? Is it still true that there has not been a proven case of mouth- penis transmission? If there has been transmission is there a common factor , such as shallow or deep penetration? Would the penis have to make contact with the throat for transmission to occur? With chlamydia do you feel that most males would exhibit some type of symptom at some point? Reading that chlamydia can clear its self even in the genitalia tract- would a couple with asymptomatic chlamydia infection continuously bounce back and fourth or would both parties clear it, or would it become symptomatic at some point prompting a need for testing? I do not have any exposure , this is purely knowledge based so I can my take the best choices moving forward. I manly stick with oral sex and always with people I know. 

Amongst unprotected penetrative sexual encounters, oral sex with an infected partner carries a lower risk for STI acquistion than penile-vaginal or penile-anal sex.  When condoms are worn throughout an encounter and do not break, condom protected sex is close to no risk at all.  

The 1.7% estimates of chlamydia prevalence in the oral cavity you mention are on the high side and likely describes data from a high risk population who have been heavily exposed. 

I am not aware of any instances in which oral chlamydia has been transmitted through fellatio.  That does not mean that it never occurs but it is certainly extraordinarily rare.  

If a man were to acquire penile chlamydia through any route of infection, he is more likely to be asymptomatic than not.  60% of chlamydial infections in men are asymptomatic.  

The sort of "ping-[pong" passage of infection you suggest has been described following treatment of chlamydia in one partner but not the other when they continue to have sex.  I am not aware that this scenario has occurred in which infections may spontaneously resolve without therapy and then be passed back and forth within a couple.  It is unlikely.

I think these sorts of "what if" hypothetical questions are really of little help in deciding when to test.  EWH

I am glad to know that you have not come across a case that has been transmitted mouth to penis. I was

 Concerned because I came across a forum where several people stated that was how they got chlamydia. 

If I were your patient, and I came and asked you about an oral exposure we are late 30s to mid 40s would you advise testing for chlamydia. Partner was a well known acquaintance 

As a generalization, following a single exposure with a known partner, particularly if you were able to talk to that partner about their testing history and other partners and judge them to be low risk, is a low risk activity and does not necessitate testing following each encounter. On the other hand, testing is always a personal decision and is easy to do. if 1 has doubts a urine test for chlamydia is highly accurate and easily obtained. EWH. 

I realize it sounds as if I am a person who gets around easily- that is not the case, I just want to make sure everyone is safe without having to test after every exposure. 

Your follow-up is somewhat repetitive and a bit paranoid.  The throat is not readily infected with chlamydia for reason which are not entirely understood.  IF you have chlamydia (unlikely), the chance of you infecting a partner through oral sex is negligible.  

This will complete this thread.  EWH