The rules have been issued in an attempt to clamp down on "violations" of the treatment of captured women which are "not permitted by Sharia law", according to the document.
The newly released ruling is apparently based on the Islamic State's belief sex slavery, much like mass killings, can be justified through a gross reinterpretation of religious texts.
Among the disturbing list of rules are that "owners" of mother and daughter captives, or sister captives can not have intercourse with both and that owners and their sons can not have intercourse with the same woman captive. Similarly in the case of sisters, he is allowed sex with only one of them.
The ruling, issued as a fatwa by ISIS' Committee of Research and Fatwas, was released publicly by Reuters on Tuesday and had been among a number of documents retrieved by U.S. Special Operations Forces during a raid targeting ISIS officials in Syria in May.
The news agency Reuters has reviewed the document but its authenticity has not been independently confirmed.
The ruling is a response to a query concerning the regulation of sexual behavior toward female slaves, noting that some of the brothers have committed "violations" in this area.
29, 2015 and details the extremist group's rules for sexual slavery, a topic ISIL theologians say has "not been dealt with in ages".
"Are there any warnings pertaining to this matter?" the authors of the document wondered.
Surprisingly, the mistreatment of female slaves is condemned in the fatwa, stating female slave owners must "show compassion [toward] her, be kind to her, not humiliate her, and not assign her work she is unable to perform". Should he have intercourse with her mother then he is not permitted to have intercourse with her daughter and she is to be off-limits to him.
Rape is not permitted when a woman is on her period, men must wait until the woman is "clean".
The document, which says that the enslavement of women and children is one of the "inevitable consequences of jihad", also implements a ruling that bans its members from having sex with a pregnant or menstruating captive, causing an abortion, or selling a captive to "an individual whom he knows will treat her badly".
The transcript goes into intricate detail as to the rules regarding what slave owners can and cannot do with their sex slaves, ranging from when it is acceptable for owners to have sex with the slaves and to whom the slaves can be sold.
It appears the Islamic State doesn't try to hide the practice but boasts about it, saying it has a "war spoils" department to manage the sex slaves.
If a female prisoner becomes pregnant, he can not sell her. They were moved "in an organized and methodical fashion to various places in Iraq and Syria".
"It reveals the actual concerns of [Islamic State] slave owners", Mr. Bunzel said.
So, the question majority of people must ask is: Who are Islamic State cadres to re-enforce slavery and capture free women and violate them against their will?
The "slaves" were then sold or given as gifts and repeatedly raped or subjected to sexual violence.