Actually, that’s a bit unfair. He’s not really saying “Gay marriage = Incest,” which would be, like, really bad. It seems like he’s trying to make the point that his film deals with a form of nontraditional love, and he’s using gay marriage as a reference point to get there. He just did it in a totally hamfisted way. What he probably should have said is something like “My film deals with a brother/sister relationship, which is one of our society’s biggest taboos. But if you’re someone who believes that you should be able to love whoever you want as long as you’re not harming anyone, I think it raises some interesting questions. Not that I support incest, or think it has any direct parallels to gay rights, but it is something worth thinking about at least.”