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Bukhari :: Book 1 :: Volume 3 :: Hadith 132

Narrated Um Salama:

Um-Sulaim came to Allah's Apostle and said, "Verily, Allah is not shy of (telling you) the truth. Is it necessary for a woman to take a bath after she has a wet dream (nocturnal sexual discharge?) The Prophet replied, "Yes, if she notices a discharge." Um Salama, then covered her face and asked, "O Allah's Apostle! Does a woman get a discharge?" He replied, "Yes, let your right hand be in dust (An Arabic expression you say to a person when you contradict his statement meaning "you will not achieve goodness"), and that is why the son resembles his mother."

Source materials are from the University of Southern California MSA site
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