In addition to (or instead of) having to specify that a post is NSFW in the thread title, the addition of a message icon to the list available when you create a new post might be a good idea.
Perhaps similar to the yellow exclamation icon, except in red.
as in:

or:

I like the red one. It's got pop!
That's a very good idea! I'll probably change that when I get home 
will this happen? just wonderin.
yeah, I guess I didn't get to it "when I got home".
I'll try to do it this weekend 
liar.
Nope, "politician". I only said that I would try.
I tried and tried but I couldn't.
then I wept for hours and hours and whours and whores and whors.
that's been a lot of weeping. So when is this gonna happen again? 
did this happen yet?
Hahahaha!
What's happening? I can't see through all the tears and whores in this thread.
