أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، قَالَتْ كَانَتْ إِحْدَانَا إِذَا حَاضَتْ أَمَرَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم أَنْ تَتَّزِرَ ثُمَّ يُبَاشِرُهَا ‏.‏

It was narrated that 'Aishah said: "If one of us was menstruating, the Messenger of Allah (PBUH) would tell her to put on an Izar (waist wrap) then he would fondle her." Translation Not Available

Book Ref: Sunan An Nisai Book 3 Hadith 374
Web Ref:  Sunan An Nisai Vol 1 Book 3 Hadith 374

---