Movies rated PG-13 are inadvisable for children under the age of 13. There may be scenes of violence, some drug use, and some profanity. There is usually not any strong sexual content in movies rated PG13.
Meaning?
No overheading or getting up to porn/hentai man, not cool.
Censors are still available in this section, you can use them.
And for the love of god, no "R" or higher rated stuff, why would this be called PG-13 if you can add R or + stuff.
Viewer Discretion has been advised.