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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Location, natural habitat, and pathogenicity all matter.
Fuck, *tap water* isnt anywhere near *sterile* but you can drink it because it has been treated to remove the vast majority of harmful organisms. Injecting it straight into your bloodstream is a wonderfully bad idea however.
Tap water isnt inherently pathogenic, but once you introduce it somewhere where it *isnt supposed to be* well, that can go badly.
Likewise, your entire digestive system is colonized with its own natural flora, but if something that lives in your butt gets to your stomach because you like to eat poop, that can go badly because that critter doesnt belong there.
This extends to a whole array of problems, IE stab wounds, gunshot trauma, aspirating stomach contents, etc
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