Organized by independent curator Stuart Horodner, Houston’s DiverseWorks director Sara Kellner, and Aldrich Contemporary Art Museum director Harry Philbrick, the elegant “Contemporary Erotic Drawing” never got hung up on what constitutes “erotic” or what constitutes a drawing. With sources ranging from comics (mainstream and underground) to the classical study, from high formal or “obsessive” abstraction to design and decoration, from the notebook doodle to midcentury abstract animation, most drawings in most media here treated sexuality as a source of delight, or, at least, an opportunity to