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Sex and sexuality are areas where our animal natures and our genes, are of more import than our reasoning. It is governed by Humean 'Is' rather than 'Ought'. The first issue to raise is, would banning porn end the industry, or make it less harmful? Demand is huge, there are estimates that porn accounts for as much as 37% of all downloads. Law can't simply accept whatever large numbers of people do, but clearly a lot of people do find porn acceptable, even if they are less vocal than those who condemn it. The issue of whether prostitution should be legal, parallels this area of questions, and different countries have settled on very different answers, eg on appeals to virtue ethics vs harm minimisation.
Gender inequality and exploitation are clearly key issues, brought into sharp focus by the recent activity of online influencer Andrew Tate. There are huge benefits for society in supporting equality and solidarity between genders, discussed here: Studies exploring the rationale of gender equality But that doesn't require directly it must be banned, OnlyFans for instance has created a lot more scope for porn creators to make money without ever having to deal with the problematic legacy porn industry. In the same way some women have always chosen to engage in types of sex work, and their right to that must be balanced against protecting those who didn't choose, from harms. There can be options for cultural change and reform that support autonomy, which may help more than a ban.
Education, can be a partial defence. A lot of focus is ut on people learning bad behaviours, but learning of good behaviours, and clarification about sex and bodies, can also happen. I think of the story about the case that led to the founding of the Samaritans, where a girl raised without her mother had never had anyone willinv to discuss what was hoing to happen to her at puberty, and committed suicide after her period began because she thought she had a hortifying shameful ailment.
Art and being exposed to experiences unlike our own, can be a partial defence. Look at the trial for obscenity of Lady Chatterly's Lover, considered pornographic when it was written. One of the things people found shocking, was the representation if female desire, widely culturally ignired in 1928 when Lawrence wrote it.
The SEP article 'Pornography and Censorship' has sections The Traditional Liberal Defense of a Right to Pornography, and Feminist Arguments against Legal Regulation.
As an area with wide implications for gender and social and cultural change and reform, a philosophical stance on pornography requires taking stances on those wider issues. Even now this is often considered an issue for students of gender studies and social sciences, rather than a proper topic for philosophy. I think that should change.