Bainbrig, I forgot t add the Koranic endorsement of rape. There are many, all pertaining to women who are bought or captured as slaves.
Here's one - Sura 4:23 saying who can and can't marry and have sex with:
"...Forbidden too are married women unless they be your slaves.".
I'll add some "expert" commentary on this verse. It's taken from the commentary on the Koran by the highly regarded Maududi and will, I hope, give you an insight into how modern day conservative Muslims think. One reason why I like to read Maududi's interpretation of the Koran. Also he had considerable influence on post-Independence Pakistan and the "Sharization" of the constitution and judiciary under General Zia (the one who hanged Benazir's dad). Check his Wiki entry. He also founded the Jamaat-i-Islami group to promote Islamic values. This group I think provided the founding members of the notorious lobby the British Council of Muslims in nineties.
Anyway, enjoy.
"Those women who become prisoners of war, while their unbelieving husbands are left behind in the War Zone, are not unlawful because their marriage ties are broken by the fact that they have come from the War Zone into the Islamic Zone. It is lawful to marry such women, and it is also lawful for those, in whose possession they are, to have sexual relations with them. There is, however, a difference of opinion as to whether such a woman is lawful, if her husband is also taken a prisoner along with her. Imam Abu Hanifah ... is of the opinion that the marriage tie of such a pair would remain intact but Imam Malik is of the opinion that it would also break.
As there exist many misunderstandings in the minds of the people concerning the slave-girls taken as prisoners of war, the following should be carefully studied:
(1) It is not lawful for a soldier to have conjugal relations with a prisoner of war as soon as she falls into his hands. The Islamic Law requires that all such women should be handed over to the government, which has the right to set them free or to ransom them, or to exchange them with the Muslim prisoners in the hands of the enemy, or distribute them among the soldiers. A soldier can cohabit only with that woman who has been formally given to him by the government.
...
(6) The maximum limit of four has not been prescribed for slave-girls as in the case of wives for the simple reason that the number of female prisoners of war is unpredictable. The lack of limit does by no means provide a license for the well-to-do people to buy any number of slave-girls for licentious purposes.
(7) The proprietary rights over a slave, male or female, as given to a person by the government are transferable like all other legal proprietary rights.
(8) The handing over of the proprietary rights over a slave-girl to a man formally by the government makes her as much lawful for him as the giving of the baud of a free woman to a man by her parents... Therefore, there is no reason why a man who does not hold marriage in detestation should hold sexual intercourse with a slave-girl in detestation.
...
(10) It should also be noted well that if a military commander temporarily distributes female prisoners of war among the soldiers for sexual purposes, or permits them to have sexual relations for the time being, such an act shall be unlawful and there is absolutely no difference between this and fornication, and fornication is a crime according to the Islamic code."
You can see from (10) and the last sentence in (6) that Islam does have high ethical standards pertaining to sex.