The Islamic State ‘rape handbook’ outlaws sexual relations, but permits the use of sex slaves.

Fathers and sons cannot have the same woman and cannot have sexual relations with their mother or daughters.

Another in the list said that IS jihadists owning two sisters cannot have sexual relations of both.

The ‘rape handbook’ was released online for the proper guidance of IS members when owning sex slaves.

Experts see it as a way to justify the IS’ ownership of sex slaves as they reinterpret centuries-old teachings that would help sanction their vile activities.

Fathers and sons cannot have the same female slave. A slaver who owns a mother and daughter cannot have sexual relations with both.

The IS also has a department that manages ‘war spoils’ as sex slaves are given to fighters as a reward for their contribution.

The Human Rights Watch interviewed 20 female escapees recounting how the Islamic State fighters separated young women and girls from men and boys and older women.

These groups moved in an organised fashion across different places in Iraq and Syria.

Fatwa No. 64, dated January 29, 2015, and issued by the terror group’s Committee of Research and Fatwas, appears to codify sexual relations between ISIS fighters and their female captives for the first time, going further than a pamphlet issued by the group in 2014 on how to treat slaves.

The fatwa starts with a question: ‘Some of the brothers have committed violations in the matter of the treatment of the female slaves.

‘These violations are not permitted by Sharia law because these rules have not been dealt with in ages. Are there any warnings pertaining to this matter?’

It then lists 15 injunctions, which in some instances go into explicit detail.