Once again, SCOTUS has seldom cited the 9th. Try again.
The 10th Amendment prevents the government from violating the rights of states or individuals.
Now, if the fedgov, through the 9th, were to define something to be a federal right that was not enumerated by the Constitution and not allocated to the fedgov, then the 10th is cheapened - or even destroyed if it happens enough. And what's next? Does healthcare become a right, and the fedgov usurps power over medical resoures that belongs to the individual? It's no different, usurping state power or usurping the rights of individuals - you may applaud the work of the federal Frankenstein today, but don't be surprised when it turns on you tomorrow.
I don't think sodomy should be outlawed by the states. But I also don't think it is a federal right or issue to be imposed on the states.