A simple PSA, lest your tail-sporting character look like they’re walking around with a really long poop hanging out of their pants.
The second one is actually anatomically correct. You’d have to either have a second spinal extremity, de-attach the spine from the sacrum, or somehow get rid of the entire sacrum—which is a large chunk of the pelvis and one of the last bones in the spine. It’s the bone that supports the spine and attaches it to the pelvis. Without it, you destabilize the entire skeleton. It’s that hard place nestled between our booty cheeks that always makes us uncomfortable on hard seating.
The tail would logically extend from the sacrum—that’s where the coccyx protrudes from. The tiny tail piece left over from our ancestors. That’s where the tail protrudes from on non-humans, and yeah, that makes it a “butthole tail.”
Sorry to add the commentary but I study anatomy and it’s hard to overlook stuff like this. I feel that misinformation should be stopped whenever possible.
I’m re blogging again so whenever someone tells me my character has an ass tail I’ll slam their head against this very informative correction.