Mainstream pornography refers to pornography produced and distributed by large porn production companies. The material in mainstream pornography is not generally based on fetishes or other sexual practices that are less often practiced or admitted to by others. Mainstream pornography includes sexual situations that the majority of people who view porn want to watch.
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Defining mainstream pornography is more easily done by defining it in opposition to independent pornography. Independent pornography typically is geared toward a specific genre or sexual interest. Independent pornography will usually involve a specific fetish or be targeted for a specific audience. Mainstream pornography will appeal to a more broad audience.