We use Google Double Click with adsense to serve our ads. We have the strictest filters that google allows. However sometimes ads either get through due to mis-categorization or some other reason beyond our control. When you see an ad that you feel is objectionable simple click on the ad and then copy the URL of the page you land on and send the link via a help ticket. Our customer service staff that submits the base URL to a black list in our google account which prevent any future ads from that domain.