The sex scene is very unnecessary
I thought this was a very good film, but a few flaws prevent it from being a great film. The sex scene ruined it a bit for me. It seemed to be in there just for the sake of being risque, it did nothing to advance the plot, and it really didn't say anything about the characters. It was just there to take up time, shock people, grab people's interest who were bored with the dramatic parts.
It doesn't bother me that it's there, but the fact that it goes on for so long is just completely unnecessary. Yes, people have sex. But I don't watch films to watch people have sex. If it advances the plot, or reveals things about the characters, that's fine. But this is just sex, and it goes on and on.
Like I said, the film is very good, but this scene interrupts the mood of the film and is completely out of place.