Adults can still view sexual material. However, the production and distribution of porn is obscene material NOT protected by the First Amendment. Private citizens certainly have the right to go after the producers and purveyors of porn. In any event, the First Amendment only prohibits government censorship. It does not prevent individuals and businesses from being the arbiters of our culture life.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus