More ideas...

1) A game to play:

http://www.bbc.co.uk/science/humanbody/body/interactives/lifecycle/teenagers/

2) A PPP:

http://science.pppst.com/humanbody/human-reproductive-system.html

3) A very interesting VIDEO in English, very easy:

http://www.youtube.com/watch?v=V6wUsMXSy4A