I think a lot of grown up adults out there forget that a child's mind is oblivious and/or entirely disinterested in sex-related stuff—even to the point they may say it's icky or funny. It just simply does not compute or click. To them, underwear is just a thing you have on like hats or shoes.

And then finally at some point they do show interest in it and the adults have zero control then anyway. They may think they do, but a kid showing interest in a statue's underwear already has highly successful skills in accessing porn or has such imagination they can jerk off to almost anything.