The Independent a few days ago:

Isis has released a fatwa detailing how and when its fighters can rape female sex slaves – “one of the inevitable consequences of jihad”.

The document, drawn up by the terrorist group’s “Committee of Research and Fatwas”, was revealed by Reuters news agency after being discovered among a huge trove of documents seized by US special forces in Syria.

…

The fatwa on female slaves, which could not be independently verified, was apparently released in response to a question on unspecified “violations” by Isis fighters owning female slaves.

It lists 15 rulings, which go into explicit detail prohibiting intercourse if a slave is menstruating or is pregnant, and banning forced abortions.

Nothing to do with the well-being of the slaves, of course. Who cares about them? No, it’s all about purity and taboos – what doesn’t matter as opposed to what does. “Never use a blue-handled knife to cut the throat of a captive” – that kind of “rulings.”

“If the owner of a female captive, who has a daughter suitable for intercourse, has sexual relations with the latter, he is not permitted to have intercourse with her mother and she is permanently off limits to him,” one says.

Because that’s eww gross haram – not because of anything to do with the mother or the daughter themselves and their feelings or wishes.

Militants are not allowed to sell slaves to anyone they know will mistreat them, the document says, adding: “The owner of a female captive should show compassion towards her, be kind to her, not humiliate her and not assign her work she is unable to perform.”

Ok there they stumble into some awareness of the humanness of their captives, but not so much that they say don’t rape them or treat them as slaves.

I wonder how scrupulously they follow the rule about not humiliating her.