The Mosaic law prohibited sexual activity outside of marriage by way of written sanctions. If one has sex with a virgin girl one was obliged to marry her, and there was not clause that stipulated that non-hebrew girls were an exception. If a girl resisted sex and could prove rape* then the above laws still applied*. Marriage subsequently, by law guaranteed a woman full heritary rights for her children whether she was a first or a secondary wife (concubine) and whether she was a Hebrew wife or a foreigner.
In the town this would involve her screaming, in isolation if she fell pregnant there would be ample evidence she had had sex. On identifying the father and she would have the right to benefit from the same rights as any hebrew girl in similar circumstances.
So no, there was no provision in the Mosaic system for keeping a girl as a "sex slave" nor for mistreating her. Under the Hebrew system all foreigners came under the protection of the law and had recall for that law for protection against mistreatment. If a slave could produce physical evidence of mistreatment (a broken tooth, arm, etc) they were guaranteed automatic freedom under the law*. It was illegal to return a runaway slave to his or her master and the premeditated murder of a slave (male or female) carried the death penalty.
JW
**Slaves must be released for grievous bodily injury caused to them: the master must let the slave go free "for his eye's sake" or "for his tooth's sake" (Ex. 21:26, 27), if either be gouged out or knocked out by him.
http://www.jewishvirtuallibrary.org/jso ... avery.html
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