I did find a loophole in the marriage problem, but it takes more work for a couple.
As previously mentioned, both myself and my boyfriend are Mithra. We wanted to do the silly marriage thing in-game, so we each made a male character mule. We're in the process of leveling them up to 20. We named the mules almost identically to our mains, so the wedding rings will be obvious.
Sure, it's a pain to level to 20 with a mule...it's a pain to pay for two weddings (but hey, two spiffy wedding dresses!) but if you're determined, there is a way around it.
I just think it's a little unfair that there is no same-sex marriages allowed when they DO force certain genders on you if you want to be a certain race. I couldn't really see the heated arguments about Square being asses if they allowed both genders of all races, because then you could just play as whatever the hell gender you wanted, and you'd have no room to complain since you could both be whatever gender/race combination you wanted. But you can't entirely do that, and that's what sucks here.