Your opinion and five bucks will get you a coffee at Starbucks...but little else. We're legally marrying, we'll continue to legally marry with or without children. Why? Because procreation has nothing to do with civil marriage.
Five bucks for a cup of coffee at Starbucks? Glad I don't live where you do! Damn
You argue that the law doesn't specifically state that marriage is between a male and a female, but any two adults are allowed.
Any reason the laws don't specify Martians? And why it is specific to only two?
The reason Martians are not mentioned is probably the same reason that getting your change back from your five at Starbucks isn't considered gambling. Laws normally don't include silly concepts within them. Do you really think that, when marriage was established as law, anyone would ever think people of the same sex would ever want to marry?
Now, let's look at why marriage is between two and only two.
If the law was intended to include same sex, the number two would be nonsense. Two serves no real purpose when those non capable of breeding with each other are included. You do realize that 10000 of the same sex could enter into a marriage contract and never produce a single offspring from within that marriage? You know that right? So if same sex was included it is nonsensical to include any number. The only number reasonable to exclude would be 1.
So it's actually pretty simple to see why ONLY two is allowed to marry. One Male to One Female = 2, which, it's rather funny, but in a manner of speaking, it is the only marriage relationship in which 1 + 1 can actually = 3, 4 or more.
Is that cool or what?
Two is also the best way for society to keep track of bloodlines so we do not breed with those too closely related, and keep order.