A relevant quote, perhaps?
>>>Rowling has never finished The Lord of the Rings. She hasn't even read all of C.S. Lewis' Narnia novels, which her books get compared to a lot. There's something about Lewis' sentimentality about children that gets on her nerves. "There comes a point where Susan, who was the older girl, is lost to Narnia because she becomes interested in lipstick. She's become irreligious basically because she found sex," Rowling says. "I have a big problem with that."<<<
Source:
http://www.time.com/t...171,1083935-1,00.html
Chris
PS: I hope that you enjoyed the film (otherwise you'll be blaming me for suggesting it!)