I have a 9 year old, and she and told her neopets friends about this site. I insist she use the obscenity filter.
I think while it may not be perfect, its definitely a step in the right direction to make this site something that can have mass appeal.
There could be actually two other things you can add to your functionality.
1-A "NSFW" button a user can add or a moderater can tag on to a comic. "Not safe for work" basically makes the cartoon invisible if you have obscenity filter on. This way you can have an adult theme cartoon with no cuss words still remain invisible. I read one the other day about a boy who walks in on his mom changing twice that day..then he adds three days. nothing 'dirty' in the language, but certainly NSFW tag would help.
2-In addition to stars, users could have a type of rating from 1-5 on how adult the theme is. Anything with a 4-5 is invisible to people with obscenity filter.
While still imperfect, both would be ideal "CYA" type of thing.
One problem with another site (YTMND.COM) is that the user community is mostly gross and disgusting. The owner could probably get better advertising dollars if he didn't have so much disgusting content in his forums and on his site. He has the NSFW concept and is trying to implement it now.