Is masturbation forbidden, and did the Prophet, peace and blessings be upon him, command it during long campaigns, and is it permissible or forbidden for a wife to lick her husband’s private parts or vice-versa, and is a woman’s madhy (pre-seminal fluid) pure or impure?

The ruling on masturbation has been previously explained. What the questioner mentioned about the Prophet, peace and blessings be upon him, ordering his companions to masturbate during battles is incorrect. Rather, it contradicts his saying, peace and blessings be upon him: "O young people! Whoever among you can afford to marry, let him marry, for it helps him lower his gaze and guard his chastity. And whoever cannot afford to marry, let him fast, for it will diminish his sexual urge." He encouraged them to fast and did not mention masturbation.