State law covers abstinence.
The Vermont Statutes 16-001-007 Comprehensive Health Education
For purposes of this subchapter, “comprehensive health education” means a systematic and extensive elementary and secondary educational program designed to provide a variety of learning experiences based upon knowledge of the human organism as it functions within its environment. The term includes the study of:
(5) Family health and mental health, including instruction that promotes the development of responsible personal behavior involving decision making about sexual activity including abstinence; skills that strengthen existing family ties involving communication, cooperation, and interaction between parents and students; and instruction to aid in the establishment of strong family life in the future, thereby contributing to the enrichment of the community; and which promotes an understanding of depression and the signs of suicide risk in a family member or fellow student that includes how to respond appropriately and seek help and provides an awareness of the available school and community resources such as the local suicide crisis hotline.