Hell, I was in the National Gallery a while back and it had a famous exhibit of a sculpted goat being penetrated by a man. Just there, in the museum. There was a warning sign that that gallery contains such works, but that was about it. Kids were roaming freely through it and past it and looking at it. No parent did anything more than "Yes, it's very funny, keep moving" and a sly smile between them all.
I'm mostly surprised that goats were roaming freely through the exhibit.