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."  

أَنَّهَا سَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ فَقَالَ لَيْسَ عَلَيْهَا غُسْلٌ حَتَّى تُنْزِلَ كَمَا أَنَّهُ لَيْسَ عَلَى الرَّجُلِ غُسْلٌ حَتَّى يُنْزِلَ  

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." (Using translation from Ibn Mājah 602)   

أَنَّهَا سَأَلَتِ النَّبِيَّ ﷺ عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ؟ فَقَالَ لَيْسَ عَلَيْهَا غُسْلٌ حَتَّى يَنْزِلَ الْمَاءُ كَمَا أَنَّ الرَّجُلَ لَيْسَ عَلَيْهِ غُسْلٌ حَتَّى يُنْزِلَ  

"لَيسَ عَلَيهَا شَيْءٌ مَا أَنَّ الرَّجُلَ إِذَا لَمْ يُنْزِلْ لَيسَ عَلَيهِ غُسْلٌ حَتَّى ينزِلَ".