The document discusses the Supreme Court's attempts to define obscenity and determine what types of expression the First Amendment protects. It provides background on key court cases like Roth v. United States and Miller v. California that established obscenity as an unprotected category. It also describes how cultural standards around pornography shifted significantly in the 1970s and 1980s with the rise of hardcore porn and feminism. More recently, technology has privatized pornography consumption while some extreme porn producers like Extreme Associates have faced prosecution.