To be fair, that was not in the Court's opinion — it was in a concurrence by Justice Stewart. People like to quote it, but it wasn't actually the law.
(A concurring opinion is written by one or more justices who joined in the Court's (majority) opinion but wish to write separately to make some separate points or explain where they diverge from the majority opinion.)
(A concurring opinion is written by one or more justices who joined in the Court's (majority) opinion but wish to write separately to make some separate points or explain where they diverge from the majority opinion.)