Yeah, I'm really in the camp of people saying "Please please please don't sleaze this thing up just for the sake of sleazing it up and trying to be like GoT." I understand that there are some adult things in the books, but there are tasteful ways of showing those things without making it completely inappropriate for younger audiences (Not super young I'm talking 12 and up).
Also, I know I'm probably in the minority here, but I kind of hope they drop the whole polygamy thing. It never really seemed to pay off as being important to the story itself in a way that it would be missed. Might be my own moral convictions coming into play there, but my opinion for what it's worth.