I agree with the Judge's decision that given the current Calif constitution, there is no justifiable reason why non-hetro marriages should be denied. This, of course, is why the Calif constitution needs to be ammended, which then drives the need for the US constitutional ammendment since the 14th will be used to challenge any/all state constitutional bans, etc.
However, while the legal issues can be argued from a fairly straightfoward logical basis, you're demonstrating a certain level of naivete if you really believe that promiscuous, homosexual sex will lessen. Anyone who knows gays (and I've known plenty) can tell you firsthand that they are not balanced individuals. And it's not a reaction against 'society' judging them either.
We're only beginning to understand the chemical makeup of the brain. I have no doubt that science will eventually isolate the reasons (ie brain damage) that drives homosexuality. At the point, we'll see whether or not the gay lobby signs up to be 'cured'.