Your ever hear men saying how wives should be submissive to their husbands? It is in the Bible. Women should come back with, "Men should love their wives..." Saying that wives should be submissive is fine, but it is not the whole story. When anyone forgets to teach the whole story, or lives their life on part of the story they are wrong.
So it is with sex. Judism and Catholicism acknowledge the intensely sexual nature of men and women and actually encourage people to have sex. It is a very old tradition. Now it is true that men and women are encouraged to wait until marriage, but there is, again, more to the story.
Our roots come from a time when women were thought of as property. If a man needed a wife he could go buy one. Courtship, dating and engagement were very different than they are today. In past times a woman could not be seen with a man who was not her husband. So, one might ask, how do you go out on a date? Even today, in parts of the world and in various cultures in the United States, the process of getting married would view things like CM as absolutely wrong. I have seen posts, on THIS website, where a Catholic priest condemned what we do on CM as wrong. His reasoning was that it lead to too much serious conversation between men and woman which leads to lust, or the desire for sex.
So fine, it is ok to say not to have sex before marriage but we should tell all of the story. Not just part of it. So what is the rest of the story?
I was expecting you to answer the question you ended off with... I'm a little disappointed. What story are you referring to?
I don't believe Catholicism "acknowledge[s] the intensely sexual nature" of mankind at all. Maybe you didn't mean it that way, but the wording sounds very modern saying this is a natural necessity. Completely UNtrue. Men and women have proved through the ages, it is possible to forebear from this aspect of our humanity. Many of us are, however, very inclined to sin against chastity.
Wives were not necessarily purchased, are you referring to arranged marriages..?
As a rebuttal to what I believe is your point (?): keeping the marital act within a lifelong commitment of marriage has both spiritual and common sense reasons. Very briefly....for the latter: stable children come from stable homes- look at the chaos and monsters our generations have been birthing! Religion is built on the societal unit- families are the building blocks of these units, again- look at our current chaos. Also, sharing yourself so completely with another person creates- intended or not- an intimate relationship with that person. A simple dating breakup nowadays is as difficult as a divorce for many people!