first of all
i'm not exactly sure why you'd want to desensitize anyone to sex. sex is fun. sex is good. children having no reaction to sex might be a good thing, but those children would eventually become adults who only want to play video games and read books, and thats no fucking fun.
i dont think kids are desensitized to wrestling. quite the opposite. i think it makes them insane.
as far as teaching them that exposed body parts and sex arent bad, i mean, you have to go back to the garden to fix all this. exposed body parts on a 12 year old girl arent bad unless NO ONE in that society decides to rape her because she's naked. teaching kids that sex isnt bad is fine as long as we're not teaching them that sex the way it's practiced among the characters in a pornographic movie, with people as mere body parts and fluids.
i'm not opposed to extending this argument as long as we all firstly agree that i'm right about the singular argument that i've already made.