I don't think that's necessarily the same thing, a conclusion you can draw. "Liking child porn" is different from recognizing teen sexuality as a real thing and having it be a part of a narrative.
I think the youth of his characters does indicate a strong belief on George's part in the capacity for young people to mature quickly if they are encouraged to/need to, if thats a part of their development, and to be able to be strong thinkers with great capacity. I recall young Brandon Stark (? - I think it was) in the books considering himself, encouraging himself, to think he was 'almost a man grown' when he is, like, 12.
The characters take on a form that conforms to more medieval standards of age, maturity, and expectations than we do in contemporary times, which was an interesting piece of the world creating/setting that he used for the series.
But this is all a far cry from site rules... This is not a Game of Thrones discussion thread...