GRRM:Here's a highly intelligent, queer, sex positive woman of color in a position of real power as heiress to Dorne, who's POV is a major portion of the book and establishes her as a crucial character in the series, and on top of that is badass and sexy.
David Benioff and D.B. Weiss:Okay but what about that kid brother she had? The one with no lines? Let's just cut Arianne, age him up, and make him heir to Dorne. Because our show just doesn't have enough sexism yet.