Here is a Cuss-O-Meter, which measures the use of profanity at various blogs and forums.
Cuss-O-MeterDemocratic Warrior
Around 3.4% of the pages on your website contain cussing.
Free Republic
Around 6.4% of the pages on your website contain cussing.
Conservative Cave
Around 6.7% of the pages on your website contain cussing.
Conservative Underground
Around 15.8% of the pages on your website contain cussing.
Democratic Underground
Around 45% of the pages on your website contain cussing.