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Arthur and Guinivere have sex, but no nudity is shown.
The "normal" version contains moderate battle violence and intense battle sequences like that of other PG-13 films. The directors cut version contains a significant amount of very graphic and bloody battle sequences with alot of blood spatter, and also flying in the air, and many severing of various body parts. There is some referenced torture, depicted pretty graphically.
A few minor words, such as damn and hell.
There is a brief drinking scene early in the film.
When the Saxons invade, they kill without mercy and appear very frightning.