Welcome back to the STD forum. I'm happy to try to help. The quick answer is that you and I (and undoubtedly Dr. Hook) are in perfect agreement.
You certainly are correct in your observation about conflicting advice between various websites and other information sources, and in your analysis of at least one of the reasons. Also, there are other issues that reinforce "an abundance of caution". In some cases, the facts aren't clear -- and when in doubt, most official sites (CDC, health departments, etc) tend to err conservatively. Sometimes, though, it is simply naivete. For example, chlamydia and gonorrhea are so similar in so many ways (types of symptoms, modes of transmission, kinds of complications) that there is a tendency to believe they are similar in ALL ways. In my opinion, this is why even many apparent expert believe chlamydia is commonly transmitted by oral sex, like gonorrhea. But chlamydia doesn't "like" the throat, so even exposed people rarely get oral chlamydia -- and thus there is rarely an oral infection to be transmitted back to someone's genitals.
Finally, another factor is one of degree. On this forum, we try to put risks in context, whereas official sites tend to take black and white stances: there is risk or there is none, nothing in between. This most likely explains why you'll find insightful advisors (like us!) talking about degrees of risk, rather than making dogmatic statements like "oral sex is high risk for herpes"; or that because HPV can sometimes be found in the mouth or under the fingernails, it must be easily transmitted by oral sex or hand-genital contact. While all these things may in fact happen (rarely), the fact is that single exposures of these types carry very little transmission risk.
Your paragraph "To me it is not helpful..." not only is reasonable, it is nearly perfect. In fact, I might start using it in future responses to other questions.
Thanks for the opportunity to clarify these important points. Best wishes--
HHH, MD
A related discussion, 5 years later was started.
Yes. Gonorrhea of the throat is less common than genital or rectal infection, but not rare; and sometimes oral gonorrhea is transmitted to partners' genitals (especially to the penis by fellatio -- less so by cunnilingus). But these days gonorrhea is a pretty uncommon STD outside selected high risk populations. Your risk for it undoubtedly is low.
Thanks for your response. Could you clear up one more thing for me. You say:
"this is why even many apparent expert believe chlamydia is commonly transmitted by oral sex, like gonorrhea".
Is gonorrhea commonly transmitted by oral sex?