If you haven't watched it, on what basis do you assert that the characterization of it as “sexualization of prepubescent children” is at all valid?

I haven't watched it, and have no specific opinion, but I certainly do know that many times when I’ve seen characterization of objectionable content in media it wasn't supported by a reasonable viewing of the media.

What do you think of child pornography, and have you watched any of it to make sure it's objectionable for you? Or were verbal descriptions enough for you to make up your mind?

you don't have to have watched it to see how it was marketed

'preteen sexual exploration' doesn't need to be a socially acceptable form of entertainment