Well sometimes anyway.
In the gay marraige thread I mentioned that overturning the sodomy law had more intentions than decriminalizing sodomy. (it's not just gay sex; a couple things heteros do is called sodomy too). Now polygamists want to be legal too.
link. The Texas decision was just a way to let all the freaks in the door. The Supreme Court has poorly defined the terms of it's decision on the matter. Hopefully Congress will have the guts to put some checks and balances in effect.