I would like someone to explain something to me, please, with respect to an elderly-couple argument for same-sex “marriage.”
It seems to go like this:
1. Man-woman marriage proponents like myself stake our position partly on the following:
a. Marriage is the comprehensive union of a man and a woman, and it is rightly thought to be so because of that which follows (b through f).
b. One central and unique aspect of a man and woman’s union is their unique bodily union, the one human biological function whose completeness is only attainable through two people of opposite sex coming together physically.
c. There are socio-psychological purposes for that union (pleasure, unity, intimacy). It is granted that these purposes are not unique to married couples, or even opposite-sex couples.
d. Along with that, however, there is also the unique biological function mentioned in b: procreation, only attainable through the physical uniting of a man and a woman.
e. Because marriage involves procreation and the nurturing and development of children, society has an interest in promoting marriages’ strength and longevity.
f. Therefore marriage is specifically for a man and woman.
2. But custom and law allow men and women to marry even if they are obviously not able to bear children, usually because of advanced age, or sometimes because of other obvious infirmity (quadriplegics, for example).
3. Therefore the argument in 1a through 1f is invalid.
(Not incidentally, the proportion of obviously non-childbearing marriages is very, very tiny with respect to the whole.)
Now, I’m having trouble seeing how 3 follows from 1 and 2. Could someone explain it for me, please, with some kind of valid logic?
Note by the way that the man-woman marriage position is based on other factors besides 1a through 1f; but this is the argument in focus for now, and it is admittedly an important one for our position. So if there is a valid objection here, we need to recognize it and deal with it as such.
If on the other hand there is no validity to this objection, then this would be a good time to drop it for good.
I’d be glad to know which is the case.