Showing both pectoral muscles and buttocks in their entirety does not work. An angled view of one while a full view of the other can be attained. This image is fine. Don't troll people because you saw a trendy picture meme. Please look through all of dA for reference.
Actually you can turn that way and not be a contortionist. You clearly are not looking at the picture well. Her hips are turned enough where she can show her buttocks like it is shown in the picture here, her front is facing straight forward which works, her back isn't showing making it only possible if you are a contortionist. and her upper shoulders are turned enough along with her head which can do a 3/4 turn. There for this pose is possible for any human being. And on the possible by chance that I am wrong and only a contortionist can do this.. then why does it matter if this drawing is like this, how do you know this character in this picture isn't a contortionist.
So the fact you had to make mention that "Bodies don't work that way" and it had to be "Covered" does indicate that you were actually kinda trolling. Please be respectful that this is simply art. There is no right or wrong or real boundaries of what a body can do. because clearly a body can do it, other wise why would people who can do that be called something i.e. contortionist otherwise?