"...If the party liable is mentally deficient, or weak, or unable Himself to dictate, Let his guardian dictate faithfully, and get two witnesses, out of your own men, and if there are not two men, then a man and two women, such as ye choose, for witnesses, so that if one of them errs, the other can remind her. The witnesses should not refuse when they are called on (For evidence)." - Quran 2:282 (read more)

"Narrated Qatada: Anas bin Malik said, "The Prophet used to visit all his wives in a round, during the day and night and they were eleven in number." I asked Anas, "Had the Prophet the strength for it?" Anas replied, "We used to say that the Prophet was given the strength of thirty (men)." And Sa'id said on the authority of Qatada that Anas had told him about nine wives only (not eleven)." - Sahih Bukhari 1:5:268 (read more)

""I would be playing with my dolls," she [Aisha] said, "with the girls who were my friends, and the Prophet would come in and they would steal out of the house and he would go out after them and bring them back, for he was pleased for my sake to have them there." Sometimes he would say "Stay where ye are" before they had time to move. He would also join in their games sometimes, for he loved children and had often played with his own daughters." - Martin Lings