Specifically, penis to mouth oral. When the penis is sucked, it hits against the palate of the mouth, leading to a specific pattern. This means that your dentist can tell if you've sucked a penis recently. Of course, I never have to worry about this, but for women, I think this is something private and embarrassing, so just a warning.
https://www.reddit.com/r/Damnthatsinteresting/comments/z38dc5
https://www.reddit.com/r/Damnthatsinteresting/comments/z38dc5
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