The evidence for this is that its urine and dung are impure; therefore, its semen is likewise impure, since all of them are bodily excretions.
If it is asked: The human being’s urine and feces are impure, so should not his semen likewise be impure?
The answer is that evidence has established the purity of human semen, unlike that of other creatures. Some scholars said: Whatever is pure while alive, its semen is pure.(1) Semen cannot be analogized to urine and dung; rather, it is akin to sweat, saliva, and the like.
The vaginal moisture of a woman, .......................................
His statement, “the vaginal moisture of a woman,” means that it is pure. The scholars differed regarding this issue.
Some scholars held that it is impure(2) and that it renders clothing impure if it comes into contact with it. They reasoned that whatever exits from either private passage is presumed impure, except for that whose purity is established by evidence.
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This view entails hardship and difficulty known only to Allah Most High, especially for those women afflicted with it. This moisture is not common to every woman: some women have an excessive discharge that comes out and flows; some experience it during pregnancy, particularly in its final months; while some women never experience it at all.
Other scholars held that it is pure, and this is the established position of the school (864).
They reasoned that a man has intercourse with his wife, and there is no doubt that this moisture