What is a "minor" ? People disagree.
Our divisions between acceptable and unaceptable behaviors are by their nature arbitrary. If we throw a blanket statement out their that the state may not define any behavior as unaceptable because of privacy then we throw out any way of the state establishing norms of any kind.
This may be where you want to go but its not where I want to go. I'm happy letting each state be subject to the will of the people in determing what restrictions shall be placed on behaviors and leave it to the majority.
I don't know anybody who's arguing that. Clearly the state can define unacceptable behavior, in spite of privacy.
The question is, just which behavior should qualify as unacceptable enough for the state to intervene.
That's the crux of the whole matter.