As we'll see, the Koran gives a waiting period for wives after a divorce if they have had sexual contact with their husbands.
Verse 33:49 says there is no waiting period if the husband and wife divorce without having s.ex during their marriage:
Koran 33:49 - O ye who believe! when you marry believing women and then divorce them before you have touched them, then you have no right to reckon the period of waiting with regard to them. So make some provision for them and send them away in a handsome manner.
As the Koran clearly says, waiting period (iddah) is only for divorced wives who have had s.exual contact with their husbands.
However, the Koran does stipulate a waiting period for pre-pubescent (premenstrual) wives. Not only does the Koran allow marriage to prepubescent girls, it seems to assume that husbands will have s.e.x with their preteen brides, since premenstrual wives are required to wait three months before they can marry again:
Koran 65:4 - And if you are in doubt as to the prescribed period for such of your women as have despaired of monthly courses, then know that the prescribed period for them is three months, and also for such as do not have their monthly courses yet. And as for those who are with child, their period shall be until they are delivered of their burden. And whoso fears ALLAH, HE will provide facilities for him in his affair.
Not only does the above passage sanction prepubescent marriage by discussing the rules of divorce for prepubescent wives, but pedophilia is also allowed since prepubescent wives are required to wait three months after a divorce - the waiting period is only for divorced wives who have s.exual contact with their husbands.