That's some stupid shiat right there.
If everyone was allowed to marry, but you could only marry someone they don't want or love, then it might not be discrimination.
Who's suggesting you can only marry someone you don't want or love?
Here's the thing, and there's just no getting around it: there's no sexual orientation requirement to getting married. There's just not. No matter how you phrase it, no matter how many "I know this one couple" you come up with, no matter how much any of you believe it's there, it's just not.
So, John can't marry Phil, and Alice can't marry Mary. That's true regardless of sexual orientation. The reason? It doesn't fit the criteria.
UNA believes the criteria is the problem, but can't give me a reason why it's wrong other than she believes it to be discriminatory. As I said above, it's clearly not, because (no matter how much you or she want it to be there), there's no sexual orientation criteria for marriage.
Feeling it's discriminatory is not the same thing as it being discriminatory.
But, why do you folk feel it's discriminatory? Because if John wants to marry Phil, he can't. So, the discrimination (since it's irrefutably not based on sexual orientation) is against people who want to do something they can't do because it doesn't fit the criteria. I say everyone who wants to be president but isn't because they didn't get the votes must, clearly by your criteria, be being discriminated against. Everyone who doesn't earn what a college grad earns simply because they don't have a college education is clearly discriminated against. Everyone who wants to practice law but didn't pass the bar exam, everyone who wants to drink milk but is lactose intolerant, everyone who wants to be considered an American Indian without having documentation of heritage, everyone who wants to pay no taxes but can't because the law says they actually earn money and must pay - all of these people are being discriinated against. And, there's a lot more of them than people who want to have the government recognize their same-sex relationship, so let's fix all those first.