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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As others have mentioned, our bodies have natural defenses. The vagina is slightly acidic, making it less than ideal for bacteria and the like to make a full assault. Nothing is perfect, however, and this is why it is always recommended to pee after sexual activity (males too!) as it helps flush the urethra of bacteria, thus preventing a UTI.
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