http://shelf-life.ew.com/2011/07/12/george-martin-talks-a-dance-with-dragons/ Here is the link. It has a couple book 5/6 spoilers. This post [the select quotes below] has only one spoiler post and it's from book 2 VAGUE BOOK 2 SPOILERS
"So I reflected that in the books. But then when you go to film it you run into people going crazy about child pornography and there’s actual laws about how you can’t depict a 13 year old having sex even if you have an 18 year old acting the part — it’s illegal in the United Kingdom." He seems a little too bummed about this