Who is going to decide what decency is at the state or federal level?
Laws like that have always been locally determined and some come and go as time change. In some localities, in the past, women had to dress in a certain manner or were considered to be lewd.
Public decency laws should never be in the hands of the state or federal government. The state and federal entities always take every advantage to extend and interpret these laws in order to dicate (dictatorship) how they will be applied.
The majority of voters as it has always been.
And your argument about laws changing with the times is exactly right. That is freedom. You are free to change the laws and to vote for new representatives but now under the dictatorial vision defended by some FReepers (including yourself) in this thread we can never change the law of the land without a Constitutional Amendment and we all lose our right to representation on public decency in our states.