But that's just a justification from carnal pleasure, the same reasoning people have uttered over maintaining their harem of enslaved concubines.

That "but it tastes/feels so good" carries any water with anyone is one of my lamentations. I was with you when you said milk, but giving up yogurt and cheese? That's just too much pleasure to lose!

If that argument works with dairy, why doesn't it work with rape and sex slavery? Or keeping a Gattaca clone alive so you can enjoy some spare organs?

Though I don't think we actually believe this argument when we use it, it's so indefensible. I think we usually come up with kneejerk decisions and then make a bunch of splashes trying to justify it, perhaps without even realizing that the decision was made before the rationalization.