Does practicing masturbation become permissible for a woman if her absent husband requests it, or does it remain forbidden in all cases?

Masturbation is forbidden for both men and women and is not permissible except in cases of dire necessity. It must be avoided even if the husband commands it, for there is no obedience to a creature in disobedience to the Creator. To overcome desire in the husband's absence, it is recommended to fast, lower one's gaze, avoid provocations, strengthen one's connection with Allah, and fill free time with beneficial activities.