Would you be sinning by sitting with your husband, advising him to stop watching pornography, for fear of him committing adultery or watching it secretly?

The prohibition of watching pornography is inclusive of both spouses. The wife must clarify this ruling to her husband and advise him against participating in watching it. The wife should entertain and comfort her husband with various forms of amusement and foreplay, schedule time for memorizing the Quran and Hadith, studying the stories of the righteous predecessors, and frequently supplicate for him with: "O Allah, forgive his sin, purify his heart, and protect his chastity."