Muhammad's Wives and Sex Slaves
Beyond these, no other women are lawful for you, nor may you exchange them for others, even if their beauty pleases you, except those your right hand possesses.
33:52It is not allowed thee to take (other) women henceforth, nor that thou shouldst change them for other wives even though their beauty pleased thee, save those whom thy right hand possesseth. And Allah is ever Watcher over all things.