More is Less
The real problem with comprehensive sex education is that we had "comprehensive contraceptive education" beginning in the 1970s and in its full-blown "beauty" in the 1980s. The rise of STD’s and out-of-wedlock pregnancy were phenomenal. Parents have no idea what the expanded content of the new generation of "comprehensive" programs teach. As teachers are required to teach the full breath of "medically accurate" aspects of sexual orientations and all of the FDA approved devices, embarrassed, uncomfortable and uninformed teachers will begin teaching less and less. The students will have little or no information. Then the parents will be blamed.

This is a great example of why it is so critical that regardless if the program is "abstinence-only" or just "sexual education", some form of educational information must be taught to children in public schools. If kids aren't properly informed about consequences, safe sex, and risky situations, they are more likely to end up in the heat of the moment with no clue what to do. From my personal expierience as a teen in public schools, I can honestly say that absolutely no sex talks or sex education has been given to me in all my years of attending public schools. All I have ever learned about sex was obtained through my parents, or through other students. So for a while, I was confused and had many questions to be cleared up. Luckily I am blessed with parents who care enough to share this information with their child. It's too bad that some teachers care more about the football team's rankings and the basketball team's winning streak than trying to keep kids from ruining their lives because they are so clueless about safe sex. If kids were scoring very poorly in one area of academics, it wouldn't ever be over-looked. Why are teen pregnancies, teen sex, etc. over-looked? Just as it is important to have a great math teacher, it is important to have a good health teacher. Kids need a little help, is it too much to ask?
Just because schools won't find teachers to teach the course correctly, doesn't mean the course doesn't work. These schools are just lazy. If the teachers don't teach right, it's there own fault and no one else's. Again, if parents aren't informed, that is their fault. I'm sure the school would be happy to tell them what was being taught if they bothered to ask. You cannot blame out-of-wedlock pregnancies on a class, just like you cannot attribute all the people who make it to marriage to the class they took. It is a personal choice not homework. Also, if a health teacher is embarrassed talking about sex, why are they teaching that class?