Is it permissible to request a divorce due to the husband's dereliction in conjugal relations, and what is the solution if it is not permissible?

We advise the wife to reach an understanding with her husband, be patient with him, and identify the reasons for his aversion to conjugal relations. They should both work to remove these reasons. If he needs medical treatment, he should see a specialist, for the Prophet, peace and blessings be upon him, said: "Seek treatment, for Allah, the Mighty and Exalted, has not created a disease without creating a cure for it, except for one disease: old age." If that does not help, and the husband does not keep the wife chaste, then there is no blame upon her for seeking divorce or khul'.