Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her) narrates: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whichever of you women believes in Allah and the Last Day should not raise her head from prostration until the men have raised their heads, lest her eyes fall upon the private parts of the men."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3302