It's like not having sexual union with a person you're not married to. You may love a person dearly, but if you're not married, you don't do the act which signifies marriage.
I am amazed that the author of this article had the ignorance (or the gall) to refer to Canon 844. It absolutely does not apply here. Canon 844 has to do with valid Sacraments, e.g. in the Orthodox Church, all of whose Sacraments are recognized as valid by the Catholic Church beause they,like we, have preserved the unbroken line of Apostolic Succession.
This is not a put-down of Reformed, Evangelical, Protestant, Baptist or what-have-you, because they do not claim Apostolic Succession as Catholics and Orthodox do; in fact, it has nothing to do with them. It simply does not apply.
In short,the author of this article is regrettably misinformed and sowing confusion.
Thank you, Mrs. Don-o, for an excellent post.