Ah, work from when he became a great example of an artistic feedback loop. All because the people who liked bigger tits were a bit more competitive when bidding on his stuff.
Since he made more from bigger titted subjects, he drew more of them and less of other stuff. That shift resulted in fewer people who wanted other things and more who were focused on big tits. Which meant that the bigger stuff gained a larger advantage. Which meant he shifted his output to follow....