Involvement by the parents could perhaps curb the limitations on what the teacher is allowed to teach, though this does allow for parental bias to come into the equation. It is important for parents to inform and remind their children about the dangers of unprotected sex as they grow into teenagers. Communication within the family can make a huge difference in the teens decision making and over outlook on sex at a young age.
change in legislation
The only way for this to change would be a federal change that would disallow misinformation in state by state curricula. However, change on this scale is unlikely.
Access to free contraceptives in schools would be a very effective way to reduce teenage pregnancy. Although, this has been an issue for many years because many parents and staff members believe it is wrong to provide condoms in middle/high schools. Teenagers should have access to condoms to avoid pregnancy and they should be informed how condoms are a very normal and everyday part of sex and there is nothing to be ashamed about. The New York City DOE HIV/AIDS Prevention Program has ordered every high school to provide Health Resource Rooms where teens have access to free condoms at any time.