A whole Lego MMO was once cancelled because they couldn't come up with an automated way to detect such things in virtual Lego buildings and using employees to filter the content became too expensive.
Every kid who has two opposite sex parents knows from toddler-hood what a penis and vulva look like, why is it such a problem??
That would go over like a lead ballon.
I don't think this is true.
I found it interesting at c.5-6 yo that our kids brought home school slang (new words to me!) for genitalia: showing they were talking about it in a non-scientific context, strongly suggesting they were talking in some way about opposite-sex genitalia with peers.