Get More: Movie Trailers, Movies Blog   Melissa Rosenberg talks to MTV about cut scenes from Breaking dawn part 1 that might end up on the DVD..   "Twilight" fans should know by now that the original sex scene filmed for "The Twilight Saga: Breaking Dawn - Part 1" was a lot steamier than the version that made the final cut. The MPAA said the film would need an R rating if director Bill Cond…