You know, here's a thing: I went to Catholic school from age 5 to age 16. (My family's not Christian, but the local public schools weren't great, so -- )
In 4th grade, girls were given a clear, scientific, extremely bland pamphlet about menstruation. It was Boring and Educational. There wasn't any class about it or anything -- just the pamphlet, provided in a plain manila envelope for you to take home.
Starting in 5th grade, the school provided a small pack of pads to girls. This was probably so that anyone who unexpectedly started her period at school would have an emergency supply, but the thing was: this boring pamphlet, this pack of pads handed to you by a nun, made menstruation...so normal. It's so normal that a nun hands you a pack of pads. It's so normal that there's a boring pamphlet. It's just a thing your body does. (It's so normal that you realize, oh, nuns have periods, huh.)
It kills me, KILLS ME, that this totally boring and bland form of education about human bodies is somehow Too Much, Too Scary, Too Sexy, for some people.