In a posture like this, the girl’s pussy extrudes, looks like a chicken comb. Maya is the worst case.
When I create animation in 3DS MAX, the exact same thing happens. I fix this in two steps.
1) adjust the limbs to minimize this problem (by butt rotation and upper body rotation)
2) push the pussy into body, so that it doesn’t extrude.
We already have the means for 1).
My next job is giving you the means to do 2). I’ll update this post when I’m done.