The Private Lives of the Royal Mughal Women : What was Harem all about?

Have you ever wondered how was the life of the sister of the great Mughal Emperor, Babur? Or the sister of Humayun, or for that matter what became of his wife? Do we as much as know their names even? What was a king's Harem (Zenana) all about? Was it meant only for the carnal pleasures of the king or had it something more to it?