Actually, I flew on SQ 12 from NRT-LAX just last week and was quite surprised to hear the F-word UNCENSORED several times in the movie "The Mexican" and other movies on KrisWorld. There was also a movie or two (I forget the names) with uncensored nudity.
I am not saying I favor censorship per se, but admit I was very surprised as it was the first time I have ever seen in-flight movies that were not censored (any five-year old kid could have been playing around with the controller and watched the same things I happened to come across). Other airlines I have flown on like JL, NH, MH, TG, AI, UA, DL, NW, etc. all censored their movies.