If you want to block **** sites or any other sites permanently on phone and computer you have some ways:
1. Install a program on your computer or an app on your phone to enable you to block any sites.
2.From your browser open "Internet Options" then from "Security tab" choose "Restricted sites" and add the sites you want to block.
3. If you use Windows 10 you can use "Microsoft Family Safety" and turn on the "Web Filtering" option. This will automatically filter adult sites.