i couldnt help myself, i had to post some of this stuff...
As for the prophet, peace and prayer of Allah be upon him, thighing his fiancée Aisha. She was six years of age and he could not have intercourse with her due to her small age. That is why [the prophet] peace and prayer of Allah be upon him placed his [male] member between her thighs and massaged it softly, as the apostle of Allah had control of his [male] member not like other believers..
Suhayli, ii. 79: in the Riwaya of Yunus i. I. Recorded that the apostle saw her (Ummu'lfadl) when she was a baby crawling before him and said, 'if she grows up and I am still alive I will marry her.' but he died before she grew up and sufyan b. Al-aswad b. 'Abdu'l-asad al-Makhzumi married her and she bore him rizq and lubab… [Ibn Ishaq, The Life of Muhammad, Karachi, p. 311]