What is the most likely and cautious opinion regarding masturbation, and is it permissible only when there is fear of semen accumulating in the body? What is the meaning of semen accumulation and how does it occur? Is masturbation necessary when there is fear of that?

Masturbation by hand is forbidden according to the majority of scholars, and this is the more correct of the two opinions in the Maliki school of thought. The perpetrator is subject to ta'zeer punishment. Some Companions and Successors permitted it out of necessity, such as fear of zina (unlawful sexual intercourse) or illness. Modern medicine confirms that semen does not accumulate in the body but is expelled through nocturnal emission. The intended meaning of "fear of semen accumulation" is the fear of illness, as continuous arousal of desire can lead to varicocele, which causes infertility.