Pride or protest, much of the past 50 years has been reflected in art. An extensive “Art After Stonewall” exhibit spans the space of two galleries — Leslie-Lohman Museum (212-431-2609, and NYU’s Grey Art Gallery (212-998-6780, — and includes more than 150 pieces by openly gay artists such as Robert Mapplethorpe, Catherine Opie, David Hockney and Andy Warhol.