Let's take a step back for a second... whether one agrees or not, it is obvious and not fairly deniable that this type of reproduction was illegal in most countries until just a few decades ago. Many major religions condemn the practice. (Until relatively recently, ALL branches of Christianity condemned it.)

It would be worth mentioning the underlying reasons for these views in such an article.

Allow me to be blunt (at the risk of getting downvoted): Does jerking off and selling your cum to strange women raise ethical issues? I think the question answers itself.