Dan Harper: When a first-grader asks, ‘Are you gay?’ Last week my 6-year-old grandson asked me if I was gay. It was an innocent question, but I was still caught off-guard. And his knowing smile made me concerned about what he might know about the homosexual world. I told him I wasn’t gay. Then I asked him if he knew what a gay person was, thinking he probably didn’t. He said it was a boy who liked other boys. Well — he knew more than I thought. First-graders are a lot more sophisticated now than they were when I was...