Is a wife entitled to seek divorce from her husband if he is unable to have marital relations with her except at infrequent intervals due to a weakness he suffers from, and the treatment for it requires financial means that he currently does not possess?

If the wife is harmed due to the husband's illness and his inability to satisfy her need in bed, then she has the right to seek divorce to remove the harm from her. The husband must engage in sexual intercourse with his wife in a good and honorable manner (bil-ma'ruf), as this is one of her most emphasized rights upon him. If he does not divorce her, she has the right to refer her case to the ruler (judge) to compel him to do so.