Erlo Stegen addresses the destructive nature of pornography in his sermon 'Curse of Porn', emphasizing that nothing should hinder Jesus from working in our lives. He highlights the importance of confessing sins and bringing hidden immorality to light, as it grieves the Holy Spirit and damages the Gospel. Stegen warns that pornography is a powerful addiction that can lead to severe consequences, including the breakdown of marriages and even criminal behavior. He urges listeners to examine their hearts and remove any sin that constrains their relationship with God, reminding them of the dire spiritual implications of immorality. The sermon calls for a commitment to purity and accountability, especially in the context of modern technology.