G - General - All Ages
Everyone from a 6-year-old literate child can read these. They do not contain violence, profanity, vulgarness, sexual situations. These are basic stories. I do not expect a lot of these, but there may be a few.
PG - Parental Guidance Suggested - 10+
A child of 10 years of age is a little bit more mature than a 6-year-old, but still there is a fine line of where you can go and where you can't. Very mild profanity and violence may be expected to occur. With violence I mean a fight between two children or a slap.
PG-13 - Parental Guide Recommended - 13+
A teenager of 13 years of age has a mind capable of grasping what's real and what's not. But if still do not think its appropriate for your teenager, please do not let them read these level of stories. Mild adult situations, such as kissing may occur as well as mild profanity and violence.
M - Mature - 15+
These stories are for teenagers and adults 15 years of age and older. They may contain adult and sexual situations, violence, and profanity. I'm sure most of these words have come out of your teenagers mouth or yours.
R - Restricted - 18+
These stories are for adults only, who are of the legal age of 18. Content may or may not contain one or more of the following: violence/abuse, sexual/adult situations, excessive profanity, and vulgarness.
NC-17 - No Children 17 and Under - 18+
These stories are for adults only, who are of the legal age of 18. Content is sexual erotica.