I would have to agree with, Seeker. I'm also a teacher and let me tell you it is JUST as uncomfortable for US to talk to YOU about this as it is for you to hear about it from us. The fact is, this will be the only time some kids get this information, so it is important. Get through it. Learn what you can and move on.

As a side note, we got our first "sex" and stuff talk in 4th grade (I was 9). It is typical for kids as young as 5 to ask questions about sex and reproduction. Adults give more age appropriate information as you get older (or they should).