REASONS I COMPARED THIS SCENERIO WITH MUTAH MARRIAGE
1)THIS WAS JUST A HIGHLY EXCEPTIONAL CASE NO OTHER HADITH EVEN TALKS SELLING OF SLAVE WOMEN THAT TOO AFTER HAVING SEX WITH THEM
2)ISLAM ALLOWS SEX WITH SLAVE GIRL BUT DOSEN'T ALLOWS "USING" THE SLAVE GIRL FOR PHYSICAL PELEASURE.
THIS EXCEPTIONAL CASE RATHER SEEMS CONTRADICTORY THATS WHY I COMPARED WITH MUTAH MARRIAGE.
3)
http://www.letmeturnthetables.com/2012/09/no-rape-slave-women-islam.htmlWILL CLARIFY THE DOUBTS
4)(24:32) Marry those of you that are single, (whether men or women),50 and those of your male and female slaves that are righteous.51,52 If they are poor, Allah will enrich them out of His Bounty.53 Allah is Immensely Resourceful, All-Knowing.

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(24:33) Let those who cannot afford to marry keep themselves chaste until Allah enriches them out of His Bounty.54 And write out a deed of manumission for such of your slaves that desire their freedom55 in lieu of payment56 - if you see any good in them57 - and give them out of the wealth that Allah has given you.58 And do not compel your slave-girls to prostitution for the sake of the benefits of worldly life the while they desire to remain chaste.59 And if anyone compels them to prostitution, Allah will be Most Pardoning, Much Merciful (to them) after their subjection to such compulsion.
HERE ALLAH MADE THE DOORS OF FREEDOM OPEN FOR ALL SLAVES AND SLVE GIRLS THAT THEY CAN BE MARRIED AMONG THEMSELVES AND AND WORK THEIR WAY TO ATTAIN FREEDOM.
5)ONE OF THE MOST IMP POINT THAT IDDAH LAW IS HIGHLY SIGNIFICANT IN THIS RESPECT AS IT WILL AUTOMATICALLY AVOID THESE SITUATIONS
6)MUTAH MARRIAGE WAS PROHIBITED BECAUSE IT IS CONSIDERED AS A FORM OF ADULTERY
SIMILARLY USING SLAVE WOMEN ON TEMPORARY BASIS WOULD AGAIN BE AUTOMATICALLY PROHIBITED AND AFTER REVEALATION OF ABOVE QURANIC AYAHS IT IS QUITE CLEAR THAT ISLAM PROHIBITS PROSTITUTING AND USING THE SLAVE WOMEN OF PHYSICAL PLEASURE AND WORDLY GAINS.
if a miltary commander permitted his soldiers to temporarily use the female captives as objects of sexual desire and distributed them among the soldiers for that purpose, such an act would be considered unlawful by Islamic Law. Such an act is not essentially different from fornication or adultery. For details see book Tafhimat, vol. 2, pp. 366-84, and Rasai'il wa Masa'il, 6th edition, Lahore, 1976, vol. 3, pp. 102-4.
7)
INDEED ALLAH KNOWS BEST!!!