The human butthole is guarded by a very strong anal sphincter muscle unlike in shrimp larvae (protozoea 3) which just seem to have a bilateral toothed flap and without the ghoulish smell of rotten egg that putrified in hell compared to humans.

Obnoxiously stinky (tainted with moist and dried tidbits of smelly feces trapped between the grooves of the external anal sphincter muscle) and Unsanitarily loaded with bad germs (bacteria, e.g. salmonella, escherichia, shigella, vibrio, campylobacter, clostridium, etcetera, viruses e.g. hepatitis virus, monkeypox virus, poliovirus, adenovirus, rotavirus, calicivirus, astrovirus, etcetera), itchy fungi e.g. candida, trichophyton, etcetera, and parasites e.g. giardia, amoeba, trichuris, ascaris, etcetera).

Behind the dress attire, bikini, makeup, lipstick, groomed hair, manicured nails, perfume, deodorant, and lotioned skin ... the human butthole remains unhygienically septic. Given the least attention being the least washed, the least cleaned, and the least groomed part of the human body.

https://www.youtube.com/watch?v=s-7O9CQt260

Obnoxiously stinky ... in fact, humans, regardless of age and gender, have the stinkiest asshole with the stinkiest shit coming out of it among all animal species on this planet.

https://cdn11.bigcommerce.com/s-zpm3yf7t7h/product_images/uploaded_images/stress-sweat-smells.jpg

Disgustingly yucky.

Thank God, shrimp butts are not stinky, ... you can scientifically work on them under the microscope without having to cover your nose while holding your breath.

And shrimp don't spurt the unpleasant nasty deadly gas in a fart, unlike humans.

Butthole!

BUTTHOLE