Naked people or representations of naked human body parts can be seen in some of these images. Obviously, I don't have a problem with this, but you might. Before my friend Teri's daughter entered the De Young Museum on a field trip in the fourth or fifth grade, the teacher counseled the class: "If some of you are going to have a problem with nude statues, you are welcome to remain here with the bus driver."

I couldn't possibly advise better.