My husband just had to shout ‘‘SPERM’’ within earshot of me and I got pregnant.
Sarah, you have an uncanny ability to mix humor with acerbity!
But were I not able to conceive, or were he to be sterile, something we could only ever have found out after we were married as we did not engage in pre-marrital sex (I like to pretend I made the man sweat it out but the reality is I almost drove myself insane

) we would have a different marriage for sure, but just as worthy and deep and valuable. We would have adopted without a doubt.
Commendable!
Married same sex couples already exist
I agree - there are already “informal” marriages in the gay community.
So why the push to have EVERYONE recognize it as legitimate?
They too can say, they are married. Not cohabitating, not living in a legal partnership, but married.
But a legal partnership, even civil unions, carry equal rights and equal protection.
It’s a matter of justice, fairness and equality.
At the risk of repeating myself, a legal partnership, even civil unions, carry equal rights and equal protection.
So, we (Catholics) sense another motive. And it is that homosexuality and same-sex marriage be recognized by ALL (including the Vatican and evangelical protestants) as legitimate. If society at large is able to be persuaded of the legitimacy of their claims, then it marginalizes those of us who believe that traditional marriage deserves special recognition as a building block of our society. It also has the effect of weakening the Christocentric belief that homosexuality is a sin, similar to what has happened with divorce, adultery, and fornication. These “sins” have become all too common; people hardly look down upon them as something undesirable, and perhaps something that is to be expected.
You are right about one thing (and probably more, but pointing out this one thing in particular).
We (Christians in general) have failed the institution of marriage, which has been sliding down the slippery slope ever since legal restrictions on the pill were removed. We also lost the fight against “no-fault” divorce. Of course, neither of those issues are being actively fought by the Church in the public arena. The Church is not advocating for new restrictions on artificial birth control; but the Church is asking the Federal government to respect Her beliefs. The Church is not advocating for restrictions on divorce; but She is seeking to foster long-lasting marriages among parishioners.
In light of this, I think you can understand why we (as Catholics) are clinging to the idea of the traditional notion of marriage. We fully understand that once marriage becomes re-defined,*** it will toll the death knell for the institution***.