User blog comment:Capn Rin Scotts/Just a Reminder/@comment-4846889-20130429164947/@comment-9933272-20130429165401

It all depends on the language (which can technically be used as long as you * some letters out,) the relationships (romantic,) topics, jokes, etc. etc. Basically PG-13 is something that would generally be suitable for someone 13 years of age, and teen is anything above that. On this wiki, Rated M things aren't allowed, obviously, so T falls in between PG-13 and M.

G is General meaning pretty much anyone could read it, while PG is okay for pretty much everyone.

Eh...I can't explain it too well. I'll try googling some 'official' guidelines in a little bit.