Tsk, Tsk, I would expect that from someone who supports illegal immigrants and the "Islam is Peace" doctrine. So its proof you want huh? Even though plenty is to be had on the internet, please refute the following taken from a Muslims translation of the Koran.
Already, when Aisha (the daughter of Abu Bakr, Mohammad's closest friend and unquestioning ally) was about 4-5 years old Muhammad started dreaming of a union with her [Ref: SAHIH BUKHARI, 5:235]
When she was 6, Muhammad asked Abu Bakr, Aisha's father, for her hand. Abu Bakr thought it was improper, because, as he said "I am your brother"; Muhammad brushed aside Abu Bakr's reservation by saying that it was perfectly lawful for him to marry Aisha [ Ref: SAHIH BUKHAR I7:18].
So, Aisha was betrothed to Muhammad, and 3 years later, i.e. when Aisha was 9, the marriage was consummated. And Muhammad was 53 then [SAHIH BUKHARI 5:236,7:64,7:65,7:88].
Aisha became Muhammad's favourite wife. And the sexuality in the relationship was predominant [ SAHIH BUKHARI .1.270, 3:36, 7:6, 3:148, 3:149, 3:150, 7:142, IbnSa'd 1pg165 ]. Later, Aisha was to be called the "mother of believers".
Amazing what a little searching for truth will do huh?