FIQH 1.50: IF ONE HAS A WET DREAM BUT DOES NOT FIND ANY TRACES OF EJACULATION
There is no need for ghusl in this instance either. Ibn al-Munzhir said, “All of the knowledgeable people known to me agree on this point.” The hadith of Umm Salamah mentioned earlier supports this proposition.
Fiqh 1.50 a:
If one wakes from sleep and finds some moistness, but does not recall any wet dream, though he is sure it is sperm, what should he do? To be safe, he should perform ghusl. Said Mujahid and Qatadah, “There is no need for ghusl until he is sure that it is sperm, for his prior condition of purity is not ended by an uncertainty.
Fiqh 1.50 b: If a man squeezes his penis to prevent ejaculation
This also makes ghusl unnecessary. This is based on the hadith which states that ghusl is required if the sperm can be seen. But, if the person walks and cannot control his ejaculation. he must perform ghusl.
Source: Fiqh us Sunnah
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