Narrated 'Aisha (Radi-Allahu 'anha):
I asked the Prophet (Sallallahu 'Alaihi Wa Sallam), "O Allah's Apostle!
Should the women be asked for their consent to their marriage?" He said,
"Yes." I said, "A virgin, if asked, feels shy and keeps quiet." He said,
"Her silence means her consent."
Bukhari Vol. 9 : No. 79