Well human body is 3d so that doesn't happen really, and this is 2d so first there's this issue of dimension and ofc they have organs butttt while reading something like this you don't wanna see their intestines and kidneys , so they can't draw it , I'm sure there's whole another genre for that. And ofc the scene doesn't go so smoothly and specifically no lubes, lord nobut again we're like a hours of process in minutes so they don't wanna break flow. And yeah that doesn't reach that far to be trying to come out of stomach, not usually .
But yeah I do agree it's so unrealistic and take it too far at times. But it's just a fiction.
Why are the dicks always fucking HUGE that can pierce their belly???