"A man may gratify his passion with his female slave in whatever way he pleases. It is lawful for a man to perform the act of Azil (i.e. coitus interruptus) with his female slave without her consent, whereas he cannot lawfully do so by his wife unless with her permission. The reason of this is that the Prophet has forbidden the act of Azil with a free woman without her consent but has permitted it to a master in the case of his female slave."