It was narrated from Abdur-Rahman bin Salim bin Utbah bin Salim bin Uwaim bin Sa'idah Al-Ansari, from his father that:
his grandfather said: "The Messenger of Allah said: 'You should marry virgins, for their mouths are sweeter, their wombs are more prolific and they are satisfied with less.'"
English reference: Vol. 3, Book 9, Hadith 1861
Arabic reference: Book 9, Hadith 1934