Rules regarding Urine and istibrā from Urine for One Whose Semen Has Been Discharged
Issue No. 1350- A fasting person who had a seminal discharge while sleeping may urinate and perform istibrā although, he may know that as a result of his urinating, the remaining semen will exit his body; even if he has performed ghusl, the discharge of semen will not harm his fast. In this case however, repeating the ghusl is obligatory.