This is illegal, anyone who has studied Islam can tell you this much. The only person who has sexual rights over a slave's body is the master, or the slaves husband if they are not seperated. This can never occur. The holy Koran clearly says that the master shouldn't force a slave into prostitution if she desires chastity.
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thats the whole point , who will enforce the rules when the rulers themselves are not free of guilt there are a lot of things allowed in islam but they are abused as the enforcers themselves are coruupted.
This can only happen in a society that "enjoins good and forbids evil" in our present state e.g in pakistan that is impossible as govt policies override all other religious laws