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Narrated Aisha, Ummul Mu’minin:

The Prophet (peace be upon him) was asked about a person who found moisture (on his body or clothes) but did not remember the sexual dream. He replied: He should take a bath. He was asked about a person who remembered that he had a sexual dream but did not find moisture. He replied: Bath is not necessary for him. Umm Salamah then asked: Is washing necessary for a woman if she sees that (in her dream)? He replied: Yes. Woman are counterpart of men.

{Book 1, Number 0236 : Sunan Abu Dawud}

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