I think everyone knows about Miranda but because she choses not to discuss it no one brings it up and because the media respect her so much they just leave her be.
But she does discuss men in interviews. I read one once where she was talking about past boyfriends and what she looks for in a man. Not playing the pronoun game, actually using the word 'man'. To me, that's not discussing it, that's choosing to cover it up. Obviously she's allowed to if she wishes but it is different from choosing not to discuss it.