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A portrait I did of Robert Crumb for class, stippling an ass. He often gets (or got, he's rather old now) sexually excited while drawing naked women or sex scenes. He always drew them just the way he liked 'em, so I decided to study
Gotta Have 'Em - Portraits of Women by R. Crumb to make sure this broad was up to snuff.
He'd probably scoff at the art, though.