How can a married woman overcome watching forbidden things, to which she resorted due to her husband's lack of intimacy, and repent with sincere repentance?

A husband must treat his wife with kindness, in a way that preserves her chastity. This is one of her most emphasized rights over him. Scholars have diligently opined that it is recommended for a man to have marital relations with his wife once every four nights.

We advise the wife to fear Allah, be patient, beautify herself for her husband, and gently express her need for intimacy.

As for viewing forbidden images, it is unlawful. The wife should seek Allah's help through piety and by avoiding His prohibitions to overcome this trial.