It's been awhile since I logged in to the Google AdSense system -- I had previously blocked any sex-related ads, but that offensive ad got through under the "video game" category, I think.

So, I've now blocked a whole slew of new categories including:

Black Magic
Astrology
Politics
Drugs
Ringtones
Video Games
Cosmetics and Body Modifications

It's funny that there would be enough "Black Magic" ads to merit their own category :-)