Just seen your post Bonnie.  I would suggest go for it.  A few years ago I
offered to give talks on breastfeeding to two girls high schools.  Both
accepted and one asked me back four years running.  Then our Min of Health
asked me to do one for a co-ed high school.  The audiences numbered 70 -
200, aged 17 - 20.  They were the most stimulating audiences I've ever
spoken to, asking the most intelligent and challenging questions.  I always
started off by saying that I was trying to "sell" breastfeeding to them, and
inviting interruptions for opinions and questions, then gave a bit of info
about the differences between breastmilk and the other (!), talked about the
hormones, how the milk comes in, how to latch the baby to the breast, how
the baby breastfeeds. Before long the questions would come thick and fast
and could be used to illustrate how "normal" and satisfying and *healthy*
breastfeeding is, why it works so well, and correct some of the
myth-information that abounds .. etc etc.  Often there would be questions
about a baby in the family. Some of the girls wanted to ask personal
questions about the breasts after the official "talk" was over.  The
feedback I got afterwards from the teachers who organized the talks was
always that the students really enjoyed them, and the teacher was often
fascinated too.

If you're able to do this, you'll find it's really fun!