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It’s only unsanitary if you’re unsanitary though.
The whole point of the linked post is that it’s always unsanitary. If you trust someone who claims to be a nurse on the Internet.
The one thing I noticed missing is the time it takes for bacteria to reach harmful levels. I am by no means a nurse, or have any knowledge on that subject. I would only imagine that removing 99% with soaps, cleaning, and being quick about eating ass reduces your chance of sickness by a lot.