Rating
Here is the rating system for the fics feature in this site
G - General Audiences (for all age)
PG - Parental Guidance Suggested (some material may not be suitable for children)
PG-13 - Parents strongly cautioned (some material may be inappropriate for children under 13)
R - Restricted (under 17 requires accompanying parent or adult guardian)
Take note that slash and Restricted fics will not be feature in this site at this moment.
*taken from MPA | Movie Ratings*