What are we teaching our pre-teens & teens about SEX??

This picture says it all, I had never really thought of it this way. What have you used to teach your children about abstinence? In our home we have talked about it since the very beginning. With our son being adopted, his birthparents were college students and that helped with explaining a lot of things. Our son had a pretty good understanding of single parenting and just how difficult life is for single parents and their children. We have used God's word in the book of Proverbs and the Song of Solomon. We have also talked about King David and his sin. Last week we got the Joshua Harris books and DVD's from the library and have been reading and watching those. Very informative.
Another of my favorites is called A Chickens Guide To Talking Turkey With Your Kids About Sex. I heard an interview on Focus On The Family with the authors and liked. Got it free from the library...check it out!
What have use used in your home regarding this topic?