Is it like the 1st amendment that you cannot use whenever you want? https://en.wikipedia.org/wiki/Free_speech_zone

you’ll see posters with topless girls etc which would absolutely cause problems in America

Personally, I understand the difference between posters and people. (Though, to be accurate, in some states, women can be topless. You might read about the Free the Nipple movement. Iirc women cannot be topless in public in more than a dozen states (with breastfeeding exemptions.)

And you're just not going to explain how you came to your conclusion eh? Just trying to be edgy or something?