When did your school teach sex ed?
Mine - it was part of physical education in 7th grade. We had maybe 3 guys who could shave and 6 girls with detectable boobs, so it was time. It was part of anatomy. (I memorized all the bones! And tried to get Mary Jane to ... well, that's another story.)
IMO, K-3 is no place to teach sex ed. Not the time/place to teach physics either. Or statistics. Or welding. Or wood shop. (Hell, our basketball COACH stuck his hand in a joiner once. Lost 3 fingers and bled all over my dad's car. The point being - again - time and place.)
If Mom and Dad, or Mom and Mom, or Dad and Dad, or Mom and Mom and Dad, want to discuss sexual issues at home, its OK with me. But school? K-3? Really?
I think folks have just become de-sensitized and politicized and polarized by irresponsible media and social media apps, and are just looking for reasons to pick political fights.
And this is one of the dumbest ever.
Can you imagine "show and tell" the week after the masturbation lecture?