In the days of old, to talk about menses; one will whisper. If there is a male around, all will hush up.
Today, Dan's classmate had her first menses experience in school. She was terrified and cried. Later; the teacher explained to the whole class what it was all about.
I remembered when I first heard of it; I was probably in Primary 5 or 6 and it was explained to us in very very hushed tone (we were all girls). I remembered hanging my head in embarrassment.
When I was in Form 4 or 5; we learnt it in Biology class. I was in a coed school then. Again, I almost died of embarrassment.
Today, children are so open on such topics. Just don't sense the 'taboo-ness' of it when they talk about it.
How the times have changed.