This is prudishness. America being terrified that might be taught about sex (gay or straight) instead of how to shoot guns is (to the rest of the world) baffling.
Is giving knowledge about a penis or vagina so terrible? Is it worse than teaching them how to effectively use a gun? Something at a person that will kill them? That's the crazy thing about America: terrified about people having sex the 'wrong' way but fine flooding their society with easy ways to kill people.
smh
BTW: I'm a little drunk as i write this so forgive my overdramatising.
As I said, it's not prudishness.
Even in other places that aren't gun-friendly, there would still be some objections to this type of content.
And I'm sure those other places would likely make a distinction between "talking about anatomy"/"mentioning/teaching about sex" vs. "underage people in a tent playing a game where they all have to do something into a bottle, and the person who finishes the deed last has to drink it"
As I said before, I wouldn't have any objections to the former.
There's a contrast between "mentioning sex"/"depicting anatomy for education purposes", and content that borders on bizarre fetish material.
This is where one side of the debate is losing some voters (who would otherwise be anti-censorship) by failing to set an objective standard, and by appealing to abstracts rather than acknowledge the specific content.
When the response to this is either "what's so bad about sex, why are you afraid of body parts?" or "what really is 'bizarre' anyway?", it comes off as being extremely disingenuous.
To use a hypothetical example (since you used a comparison to guns),
Say you were bringing up concerns about the proliferation of guns and the potential issues with them.
If someone responded "Why are you so afraid of a piece of metal?" and "What are you so scared of the concept of someone defending themselves?"... it would be pretty apparent that the person was dodging your concerns by way of appealing to abstracts with the aims of making you seem like the one being unreasonable for having concerns.