The statement of the Imam عليه السلام, "If it is something that comes out without pleasure or relaxation, then there is no problem," means that the discharge is not considered al-ma’ al-akbar (seminal fluid). It is rare, according to natural and customary conditions, for semen to be discharged from a person without accompanying pleasure and relaxation. The intended meaning is that if a person is uncertain and mistakenly believes the discharge to be semen when it is not, he should verify this by checking for the presence of pleasure. If pleasure is present, ghusl becomes obligatory; if it is absent, it can be concluded that the discharge is not semen.
Commentary #3