You can provide ParentalControl Bar with a list of sites to block, but here is also a generic filter for blocking adult content even if a site isn't currently on the blocked list. Unfortunately, the filtering mechanism doesn't seem to work all that well. In testing this product, I didn't explicitly block any site, but I did configure the filter to block adult content. After doing so, I was able to access several adult sites without any problem. Ironically, the utility blocked access to MSN because the site was unlabeled.