Eli5: if there are a ton of harmful bacteria in every persons mouth, why is it relatively safe to give/receive oral when genitalia is so sensitive to foreign bacteria?
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It really depends on what is there. The human vagina itself is acidic and has its own bacteria flora, so it’s not like adding oral bacteria to a clean petri dish. Some bacteria can be pretty environment specific and there’s bound to be competition in the human vagina. It’s not going to be a 1:1 transfer. A bacteria used to a certain pH, moisture, and substrate might not do so hot in certain areas. Also I am not too sure the human mouth is filled with harmful bacteria. What do you mean by this?
But for STIs like chlamydia that hide inside our mucous membranes and get inside our cells, that can transfer from oral to genital because both have mucous membranes. But this is not a native bacteria for humans.
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