Exhibit 1. Saw this x-ray panel today in one of the random comics. I don't think you can get that much of a human tongue into an anus without detaching it first.

Exhibit 2. It's pretty common for male porn artists without sexual experience and/or art training to not understand how close the vagina and anus are. But you rarely see the reverse, like in this Yellow Elephant panel, where she (I assume) thinks that the male anus is located on the taint, immediately behind the testicles.
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Exhibit 3. Just saw this one in the new "Sumire-san" manga. The uterus is not connected to the digestive system, idiot.
Genuinely frightens me how much how much dominion shitty doujins have over the concept of womens' anatomy over literally any other source