Really. Telling them "Sex is bad and not for you: don't do it" has the net effect of increasing teen pregnancies and STDs, while Comprehensive sex ed decreases them. So, generally, the people attacking sex ed are the ones who are okay with teen pregnancies and STDs, and who are denying kids the language to identify and reject predatory behavior.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3194801/
Me, I'm against predators and STDs, so I'll keep supporting policies that stop those vermin.