Is masturbation permissible for an unmarried person, provided it is done in a tight and uncomfortable place to curb lust, not for pleasure, and given the inability to marry or fast due to studies?

Masturbation is forbidden, and its conditions do not permit it due to its harms. However, some scholars have allowed it for one who fears falling into fornication and cannot prevent himself except by it, because it is less harmful than fornication due to the gravity of its sin.