وأما قوله أباح للرجل أن يستمتع من أمته بملك اليمين بالوطء وغيره ولم يبح للمرأة أن تستمتع من عبدها لا بوطء ولا غيره فهذا أيضاً من كمال هذه الشريعة وحكمتها فإن السيد قاهر لمملوكه حاكم عليه مالك له والزوج قاهر لزوجته حاكم عليها وهي تحت سلطانه وحكمه تشبه الأسير ولهذا مُنع العبد من نكاح سيدته للتنافي بين كونه مملوكها وبعلها وبين كونها سيدته وموطوءته وهذا أمر مشهور بالفطرة والعقول قُبحه وشريعة أحكم الحاكمين منزّهة عن أن تأتي به
إعلام الموقعين عن رب العالمين الإبن قيم الجوزية فصل الحكمة في جواز إستمتاع السيد بأمته دون العبد بسيدته
Regarding someone who says a man is permitted to enjoy a servant girl that is under his right hand, with intercourse and other things, and a woman is not permitted to enjoy her servant, either with intercourse or other things. This too is of the perfection of the law and its wisdom; for indeed a master subdues what he owns, rules over it, and holds it; and a husband subdues his wife, rules over her, and she is under his authority and direction, similar to a prisoner. For this reason a slave is prohibited from having relations [nikah] with his mistress due to the mutual incompatability between his being her ownership and her husband, and between her being his mistress and the woman he has intercourse with. This is a well-known matter in the natural disposition of things, discerning its repulsiveness, and the law of the wisest of rulers must infallibly decree it.
Ibn Qayyim, I’lam Al-muwaqqi’in 'an Rabb Al-'Alimin [The Notifications of those who write for the Lord of the Worlds], Section: The wisdom of it being permissible for a master to enjoy his servant girl but not a slave his mistress