At “The Artist Is Present,” an exhibit at the Museum of Modern Art in New York that’s part of a Marina Abramovic retrospective, performers stand naked on display for visitors, staring at each other while immobile. Apparently the sight of naked men and women in a public setting has given some attendees reason to think they’re there for the touching. One 30-year MoMA member had his membership revoked for groping a male performer. Then there are the men who push their (clothed) erections into the performers’ hands. But don’t patrons know the golden rule of museums? Never, ever touch the art.