"The Prophet was asked about a man who finds wetness and he does not remember having a wet dream. So he said: 'He is to perform Ghusl. And (he was asked) about a man who had a wet dream but does not find any wetness, so he said: 'No Ghusl is required of him.' Umm Salamah said: 'O Messenger of Allah! Is the woman required to perform Ghusl if she sees that?' He replied: 'Yes. Indeed women are the partners of men.'"
Reference: Jami` at-Tirmidhi 113 In-book : Book 1, Hadith 113 English translation : Vol. 1, Book 1, Hadith 113
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