Sheikh `Abd al-Wahhâb al-Turayrî, former professor at al-Imâm University in Riyadh
You should know that what your husband is doing is very wrong and sinful. At the same time, dear sister, your situation is not as dire as you seem to think it is.
Your husband is weak in front of his desires and it is fortunate that he has not been compelled by this weakness to take matters further than looking at pictures and masturbating. Unfortunately, many wives have husbands doing far worse than that.
What your husband is doing is undoubtedly sinful. But keep in mind that many people are engaged in deeds that are far more sinful. Lying and deception are more sinful. Backbiting and slandering others is more sinful. Not praying on time is more sinful.
Dear sister, try to be patient with his hurtful deeds. Try to fill his life with virtuous things. Try, in a subtle way, to get him occupied with activities that will benefit him. Try to get him to associate with virtuous people if you can. In this way, he may improve and give up his sinful ways.
Source: Islam Today