The opinion "porn bad" (for children) isn't limited to conservatives or religious people.
Here's what Unicef says:
> Pornographic content can harm children. Exposure to pornography at a young age may lead to poor mental health, sexism and objectification, sexual violence, and other negative outcomes. ...
> UNICEF is alarmed by the massive quantity of pornography available online, including increasingly graphic and extreme content that is easily accessible to children of all ages. Efforts to regulate content and restrict children’s access to pornography have not kept pace with technological shifts that have profoundly altered the landscape for the consumption of pornography.