It is narrated from Sayyiduna al-Hasan bin Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) prayed while men and women were performing tawaf in front of him, on the side of the Black Stone, without any barrier (sutrah).
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2721