Stanley v. Georgia considered the question from the right to privacy side, not the first amendment. The relevant cases are https://en.wikipedia.org/wiki/Ashcrof

Stanley v. Georgia considered the question from the right to privacy side, not the first amendment. The relevant cases are https://en.wikipedia.org/wiki/Ashcroft_v._Free_Speech_Coalition https://en.wikipedia.org/wiki/Ashcroft_v._Free_Speech_Coalit... and United States v. Williams https://en.wikipedia.org/wiki/PROTECT_Act_of_2003#Supreme_Court_cases https://en.wikipedia.org/wiki/PROTECT_Act_of_2003#Supreme_Co...