Busrah bint Safwan al-Asadiyyah (may Allah be pleased with her) heard the Prophet (peace and blessings be upon him): he (peace and blessings be upon him) "used to order ablution after touching the private part, and a woman will do the same."
(b) Abu Ahmad bin Adi (may Allah have mercy on him) said: This addition in the text of the hadith, "and a woman likewise," is narrated from Imam al-Zuhri by no one except Ibn Namir.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 634