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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We are literally swimming through a sea of particulate matter, spores, bacteria, viruses and the detritus of all. You are not infected by any one (or one thousand) pathogen, you loose a battle in a never-ending war and succumb to overwhelming numbers.
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