The Tivo units allowed you to edit the "channels I get" list, so that based on whatever you selected, channels would not ever appear if you didn't want them to - whether you were using a favorites list or not.Tivo does it this way too and it is a very easy and simple solution for the user. It also streamlines searchs.
But working with an HR2x isn't there an adult channel block that totally eliminates the specifically adult channels from the guide so it's like they don't exist?
I just use a favorites list to 'work around' seeing channels that I don't want to, but I agree that it would be nice to have an option similar to the Tivo units. I thought I had heard that was something possibly being added? While they did change it so channels you don't receive are grayed out, they do still appear in the guide when viewing the full channel list.