حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَلِيُّ بْنُ مُحَمَّدٍ، قَالاَ حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ عَلِيِّ بْنِ زَيْدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ خَوْلَةَ بِنْتِ حَكِيمٍ، أَنَّهَا سَأَلَتْ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ فَقَالَ ‏"‏ لَيْسَ عَلَيْهَا غُسْلٌ حَتَّى تُنْزِلَ كَمَا أَنَّهُ لَيْسَ عَلَى الرَّجُلِ غُسْلٌ حَتَّى يُنْزِلَ ‏"‏ ‏.‏

It was narrated from Khawlah bint Hakim that: She asked the Messenger of Allah about a woman who sees in her dream that which a man sees. He said: "She does not have to take a bath unless she has an orgasm, just as man does not have to take a bath unless he has an orgasm." Translation Not Available

Book Ref: Sunan Ibn Majah Book 1 Hadith 602
Web Ref:  Sunan Ibn Majah Vol 1 Book 1 Hadith 602