LOL! I would settle for a little more time to relax and watch any TV!
I would respond, though, that monogamous behavior / shared purpose demonstrates only what you mention: the goal of raising children. It does not, on its face, demonstrate or even imply that a purported “unitive function of sex” was the motivation that drove that behavior!
We are talking about animals so there is no motivation in a reasoning sense. The sexual urge (that humans have as well) would be the motivation that makes them want to have sex.
Read this however:
en.wikipedia.org/wiki/Animal_sexual_behaviour#Sex_for_pleasure
It describes how some animals do have sex for pleasure, or in other words a good mutual feeling that makes them bond. They are doing it because they want to bond, but it makes them bond none the less which was my point. I think dolphins would be the best example of this if you want one particular example to look into more.
Obviously animals do not reason and they do not choose to have sex out of a want to bond but rather end up doing so after being motivated by a sexual urge. Humans act similarly although if there was no sexual urge i.e no pleasure do you think humans would still want to “bond”? We are motivated by a sexual urge as well, however we have the ability control ours through reason. This idea is expressed really well in Love and Responsibility.
(OK – as an infrequent Animal Planet watcher, I don’t know, so let me ask – when we see animals sharing parental duties, do we always see continued sexual activity? when we see a lack of active searching for different sexual partners, do we see a continuation of sexual activity between parents?)
Very few have sex for pleasure or bonding above procreating as seen in the above wikipedia link. Some do show this behavior though. Again, my point was that sex is a bonding experience for some animals, not that they have sex at times exclusively for bonding. When they have sex to procreate, it also bonds the two together though.
In the 1917 Code, sure. Not in the current CIC. That teaching has been superceded by one that asserts a non-hierarchical set of purposes of marriage!
You are taking my statement here:
Indissoluble marriage gets its purpose for existence from the fact that children exist
And assuming this implies one purpose is more important than the other. Is it not possible as I suggest that one only has reason to exist because the other does, yet they are both equally important for a marriage still?
Nonetheless, optimal upbringing is not mentioned by the Church (as opposed to “education”, which is – and I don’t think that, on the basis of what you’ve mentioned here, you can make the case that the education of children is dependant on an integral marriage. (There’s a certain correlation there, but not a strict causative relationship.))
uh its mentioned a lot by the Church when you start talking about homosexual marriages haha. A mother and father each provide specific emotional and material support that a child needs. Yes, it is causative but I’ll reiterate that this does not imply the two purposes are not both equally important for the success of a marriage and raising kids.
That’s exactly the point! Marriage doesn’t derive its purpose strictly from a biological standpoint! So… attempting to define marriage in strictly biological terms – especially considering that a proper Christian anthropology would assert that strictly biological considerations aren’t the end-all and be-all of human existence – is a non-starter!
We were created by God in strictly biological terms though and humanity didn’t receive the totality of Divine Revelation for quite awhile. I’m only describing marriage in strictly biological terms as a foundation to apply the added meaning that Divine Revelation supplies. Divine Revelation does not contradict the biological reality though, but rather upholds it.
I think your first sentence hints at the reason why your second sentence fails: “increased intelligence” and “complex bonds” aren’t at the heart of the reason that marriage is what it is: rather, “immortal souls” that are made in the image and likeness of God are! The unitive purpose of marriage, expressed (imperfectly) and enhanced, as they are, in the conjugal act, speaks directly to this imaging of God’s love in our experience of human marriage!
Haha are not our bodies also created in the image and likeness of God, and is this not actually the great reality being expressed here? God did not say our souls alone were created in his image and likeness. He also did not say:
Gen 2:24
“For this reason a man will leave his father and mother and be united to his wife, and they will become one soul.”
He said:
Gen 2:24
“For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.”
This “one flesh” includes the spiritual reality as well but that is not even the primary meaning of what is being related here.
Ouch!

I think, though, that I would argue that this wouldn’t be evidence of a “unitive bond”, but of a (largely instinctual and biologically conditioned) set of physical behaviors…!
Blessings,
G.
p.s., thanks for this discussion! It’s been an opportunity for me to step back and engage in some fruitful reflection on marriage!!!
Haha its true. Some animals are better at being monogamous than humans are currently lol. As you said though when your purely just acting of instinct and you don’t have reason to get in the way it makes sense that this is so.