In any case, slavery was a necessity of war at that time, and it was the system of dealing in reply. However, it was not a result of the Islamic social system. The law prescribed in the parenthesis is only applicable to men as is clear from the Text and the bondsman is unlawful for the woman possessing him. The wisdom why the slave has been forbidden for the woman is that he can only satisfy her sexual desire but cannot become guardian and governor of herself and her household, which leaves a serious flaw in the family life. The jurists only differ slightly with regard to masturbation.
Masturbation is unhealthy and can lead to medical and psychological problems.
The jurists agree that anything that brings harm is unlawful especially if it becomes a common habit. The deviant Shi'ite view that Mut ah is absolutely lawful and permissible has no sanction and support in the Qur'an, Sunnah or sound mind. The fact is that a few of the companions, their followers and jurists who regarded it permissible in the early days of Islam, did so only in cases of extreme necessity and need. Even Ibn 'Abbas had to revise his opinion when he saw that people were abusing permissibility and started practising Mut ah freely regardless of genuine need and necessity. For if Mut ah it would imply that there should exist in society a low class of women, like the prostitute who should be available for the purpose as and when required, or if not that, Mut ah be restricted to the daughters and sisters to the poor stratum of society and the well to do be given the freedom to exploit them as and when they like.