Does masturbation by the wife with her hand, or vice-versa, conflict with noble morals and good customs, knowing that it is permissible in Islamic law?

A man is permitted to enjoy his wife in any way, except for anal intercourse and vaginal intercourse during menstruation or post-natal bleeding (nifas). Everything else concerning her body is permissible at all times. The majority of jurists have permitted masturbation by the wife's hand.