All five SSM arguments on Balkinization become moot:
"1. It violates sex equality to tell a man he cannot marry another man when a woman could do so." Not when it is "completely unethical" for a man to attempt to proceate with a man but completely ethical for him to attempt to procreate with a woman.
"2. Sexual orientation discrimination." Eggs and sperm don't care what the orientation of their maker is, nor does the ban on non egg and sperm procreation.
"3. Irrational discrimination." No, it's completely rational, because the scientists themselves say it would be completely unethical to attempt this in humans. Just think of the other 9 mal-formed mice that couldn't make it to adulthood, not to mention the 371 that couldn't make it to birth. It's irrational to allow people to try it on people.
"4. animus at a specific social group" You can't claim animus if the ban is completely rational, to protect the people being created.
"5. violates a fundamental due process right to marry" That fundamental right is the right to attempt procreate found in Skinner, but naturally, not using a completely unethical technology (or else, the court could have said that Skinner could still conceive with technology someday). People have a fundamental right to be straight and marry someone of the other sex, and gay marriage actually encroaches on that right.