I don’t think books or reading material should be rated. Libraries and bookstores have their books in sections for different age groups: children’s books (G), juvenile (PG), YA (PG-13), and adult (PG-13, R, and up). I think splitting books up by age group serves as a sufficient “rating system.”
Once a child turns 13 or reaches an appropriate level of good judgment, I don’t think parents should restrict that child’s reading material anymore. Some may argue that reading “explicit” material may somehow be less “offensive” than watching it. I don’t necessarily believe that – but then again, what people consider “explicit” or “offensive” is often very subjective.
So… what do you think?