How would Brienne feel if she found out that Renly preferred men? Would it even matter to her?
Christie: I think that she just loved him. At this stage in her underdeveloped mindset, this is the first love that she’s ever had for a man. She’s willing to die for him, her feelings are so great. But I don’t think it would actually matter because her intentions are not sexual. They are to protect him. I don’t think it would matter if she knew that he was gay. Again, I think it’s really heartening and refreshing. It’s a very, very pure love.
— interview with Gwendoline Christie on tvguide, April 11, 2013.