pornography laws
The majority of countries, including the United States, define pornography as the fact that the material is obscene. In the United States Supreme Court case Miller v. California, a test is given to define obscenity as a work that has sexually oriented materials that appeal to a prurient interest, which has patently offensive manner, and lacks serious literary, artistic, political, or scientific value. A lot of debate has been focused on explaining how to define "contemporary community standards," which are subjective and can be altered with time, resulting in inconsistent enforcement and court challenges.