The California Department of Education has provided many resources for teachers and curricula-writers to use in the development of new curricula or as a resource to their district's chosen Sex Ed curriculum. Here are several resources, provided by the CDE on their website, that you might be interested in perusing, all of which focus on teaching our children how to have healthy and satisfying sex lives, rather than why it's important to delay having sex until they are older. The It's All One Curriculum is one of those resources. Their stated objective is as follows:
"The ultimate goal of It’s All One Curriculum is to develop the capacity of young people to enjoy — and advocate for their rights to — dignity, equality, and responsible, satisfying, and healthy sexual lives."