You might also want to take a peek at your title:
"Free Nude Teens"
That are 3 keywords search engines don't like. "free" because it is often used and abused. "nude" is sits right after "porn" and "sex". "teens" sits under "child". The combination "nude teens" might trigger bells at google, cause teens relates to child and nude relates to porn, getting a result like "porn child". You get the idea.
One thing is sure it isn't the blog submitter, because just think about it, when that was true over 10.000 blogs submitted with the blog submitter should have landed in supplemental. And that hasn't happen. It is more likely the content of your blog.
I did made a filter for a blog directory (
http://www.adultblogturtle.com/ ) to filter out these bad word combination and i still have to see the results but at cozy's forum some peeps had good results with doing this.