“If she is a virgin, (her slave owner) can have intercourse with her immediately,” ISIS explains, according to the MEMRI translation. “However, if she isn’t, her uterus must be purified.”
There are other rules as well, like that two men who co-own a captive can’t both have sex with her and that a man can’t have intercourse with his wife’s slave.
As to girls: “It is permissible to have intercourse with the female slave who hasn’t reached puberty if she is fit for intercourse,” the document reads, according to MEMRI. “However if she is not fit for intercourse, then it is enough to enjoy her without intercourse.”
The Q&A is clear that, young and old, the captors have full control of their captives.