PG-13
Some of the subjects in Deuteronomy are very adult, but the kids in the room will probably be snoring by the time they get to them anyway—they're all mixed in with laws.
The sex in Deuteronomy isn't made up of steamy love scenes that heat up the screen and inflame your passion. It's more like watching one of those uncomfortable videos in health class. Deuteronomy talks about stuff like wives showing proof of virginity or what the penalties are for rape.
The violence consists of laws for war and punishment for crimes. Picture the courtroom scenes in Law & Order. You don't get to see the crime, you just learn what happens to the perp.