What are the worst myths you were told by teachers in high school?

Numerous scary facts would be all the sexually transmitted diseases and unwanted pregnancy at such a young age. Oh I think they should continually teach abstinence especially to the younger crowd. I don't remember being taught any wrong sex facts by teachers but thats just me.

I was in high school during the 1980's and teachers were surprisingly open about sexuality. I think I was far more screwed up by the ideas put forth by Dr. David Reuben's Everything You Always Wanted to Know About Sex (But Were Afraid to Ask) - which I read at the age of 12 - than anything I learned in school.

My sex ed courses were somewhat lacking, but thankfully what was there was accurate. For example male masturbation was given some passing mention, but the clitoris and female masturbation were left out altogether. Abstinence was encouraged, but we weren't told the common lies about condoms being ineffective, so that much at least was fair.

What disturbs me is the fact that abstinence-only programs exist at all, and the lies and misinformation they spread concerning birth control. Areas that use abstinence-only sex ed have much higher teen pregnancy rates than those that use comprehensive sex ed. This being the case, shouldn't folks have woken up by now?! Preach abstinence all you want, that's fine, but the bottom line is that many young folks will follow their natural drive and end up having sex, and it's better that they be prepared to do so as safely as possible.