I didn’t have pretty good knowledge over the subject of slave girls, so can’t throw anymore light but on this point you made a mistake; Sunnah means the practise of Rasoolullah sallAllahu 'alayhe wasallam which we should follow. As you yourself clarified that he sallAllahu 'alayhe wasallam kept more than 4 wives, but you know that this is not the Sunnah of our Prophet sallAllahu 'alayhe wasallam. Then he sallAllahu 'alayhe wasallam went on Me’raaj but this is not his sunnah for us, we can’t go to Me’raaj. Tahajjud prayers were, if I am not wrong, fardh (obligatory) for him (s.a.w), not for us.
And to your qestion that sex with slave girls was only a temporary arrangement, my answer is that you are wrong here; as Allah clearly says in His Book which is valid for you and me also, in 2005 till the last hour:
And those who guard their chastity, (70:29)
إِلَّا عَلَى أَزْوَاجِهِمْ أَوْ مَا مَلَكَتْ أَيْمَانُهُمْ فَإِنَّهُمْ غَيْرُ مَلُومِينَ
Except with their wives and the (captives) whom their right hands possess,- for (then) they are not to be blamed, (70:30)
فَمَنِ ابْتَغَى وَرَاء ذَلِكَ فَأُوْلَئِكَ هُمُ الْعَادُونَ
But those who trespass beyond this are transgressors;- (70:31)
If Allah is not saying that having sexual relations with slave girls is a temporary arrangement then how you can make better laws then Quran.
Well, suppose you are right, then we will see what happens next:
Suppose there is a war between Muslims and Christians in 2006 and as you know in American Army there are women fighters as well, even in Iraq attacks, Saddam Husain’s men did capture some of them and they were showed on TV as well. Now if in such a war/jihad, Muslims defeat Crusaders and capture their women, the status of such women would be the slave girls. The Ameer or Khalifah of Muslims would distribute them along with the booty of war amongst the mujahideen. Now please don’t tell me this is against women rights to capture a woman and make her a slave.
Well this is not true.
The woman made a rebellion to Allah and fought a war against His people. If a woman rebels against the government of United States, or if a woman cheats her husband and has a sexual relationship with another guy, she does receive a punishment from the law court in this civilized world, but if a woman rebels against Allah and fights or supports a fight against the Fighters of Allah and against Islam, why she can’t deserve for a punishment then.
She must be given the status of a slave girl or a captured woman, and she would be given in the custody of only one man or woman.
Please note that if the captured slave is under the custody of a woman which means her master is a woman, **then no other man can have sex with her **because no other man would be the master of her.
But we suppose that the captured American lady is given in the custody of an Afghani Pathan (Taliban). Off course this Mujahid has been given the rights from Allah to sleep with this American lady without marriage. Please note that no other man can sleep with her, though if a Muslim woman is captured by Kuffar (Allah forbid) they don’t follow any rules and mostly the woman is gang raped and tortured. Off course Islam stops ways of all such crimes, in other words Islam is the only protector of women rights.
If sleeping with the slave girl was not allowed then tell me what would happen to this American captured girl?
Who would support her and why, when she was of no use, if she can’t fulfil the sexual urge of any guy, why one would take responsibility to feed her and to provide her with shelter?
Moreover this American captured woman must be so civilized believing in free sex. Don’t you think this American captured lady would spoil so many people by inviting them to have an illegal sex with her?
Off course the treatment of a slave girl (captured one) as prescribed by Islam is just and based upon logic rather the best. If we can’t see anything good in this type of sexual relationship then this is the fault of our comprehension and level of intellect. We should improve our intellectuality in order to understand Quranic Laws. Though for every Muslim, Quran is to be blindly believed and accepted.