Honestly, I’m not sure where the line should be.
There’s a popular hotel in my city that displays modern art throughout the lobby, and there was a 10 foot photograph that featured 5 men, with full frontal nudity, in almost high definition quality. It was funny to see parents freak out and shield their children’s eyes from seeing it. But surprisingly, it didn’t cause much controversy.
The picture itself wasn’t that artistic though, looked like something anyone could do with a smart phone.
However, another photo in the hotel featured an erection, and that got taken down after complaints.