Yes, you can use HostName Commander to block adult web sites, if you can find a comprehensive list of the host names of such sites. Keep in mind that new adult sites with new host names appear daily, so keeping track of all of them is not practical. Instead of HostName Commander, we recommend to use web-filtering software that blocks access to the adult sites by analyzing the content of the web pages downloaded from them. This makes such blocking more effective. There are many content filtering programs available on the Internet, use you favorite search engine and you may find something suitable for your requirements.