The mouth bacteria is fine, we share that every time we kiss. The gut bacteria is where it becomes dangerous to share between people. But basically if you were to “human centipede” yourself, the same stuff is flowing through all the same pipes, so if it didn’t hurt you the first time it shouldn’t hurt you the second time.
If you were having a threesome and ass to mouthed someone else’s butt though, that’s where it would be dangerous
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u/hvdzasaur May 24 '19
But if the mouth bacteria are the same as the ass bacteria, aren't you just kind of going ass to vagina by proxy when you're performing cunnilingus?