That's what I got from reading this report by Jacques Hyzagi in the Observer on his visit to a tiny French farm town, Robert Crumb Hates You.
The entire interview is mostly about Robert Crumb's abysmal sex life history that he cannot talk about very well but can draw in imaginative detail like Woody Allen's anxiety but a lot more graphic and gross, how all that was so horrible the whole time and published in his panels until he learned the secret of being a direct jerk to women and fame arrived and changed things and he aged so that most of all that no longer matters.
He's into fat women.
And thankfully that article ends.
Another article picks up on the subject of Robert Crumb, written earlier in January 2015, Legendary Cartoonist Robert Crumb on the Massacre in Paris by Celia Farber. It appears on the same page linked.
The Observer does not print the cartoon that they're writing about. They describe it. It's a cartoon of Crumb the cartoonist holding up a picture of a man's hairy butt.
Google Images [crump, hairy ass muhammed]