R
The Second Book of Samuel is filled with hair-raising incidents of sex and violence. There are the numerous war sequences, Joab gutting Amasa, home-invaders beheading Ishbaal, Absalom having sex with his father's concubines, Amnon sexually-assaulting Tamar… And there's plenty more where that came from. This book is an R if there ever was one—possibly even an NC-17, though it would be a little tasteless to go that far with, like, a Bible movie. But we're talking about Hollywood… Like Michael Palin said in Monty Python and the Meaning of Life, they just want to see "Presidential candidates stabbing babysitters with knitting needles" and stuff like that.
Well, at least there are no drugs…