This teacher's guide presents material suitable for junior and senior high school physical education, health, or home economics classes concerning life cycles and sex education. Unit 1, understanding the self, contains lessons on personality, self-image, defense mechanisms, peer groups, and the conformist. Unit 2, dating, contains lessons on going steady, premarital sex, birth control, abortion, and venereal disease. Unit 3 discusses the engagement period of a relationship. Unit 4, marriage, examines marriage, alternatives to marriage, and divorce. Unit 5, reproduction and the family, explores changes in family structure, the male and female reproductive systems, the menstrual cycle, conception, and pregnancy and childbirth. And unit 6, the end of life, contains a lesson on old age and death. Each unit contains a discussion of the main topic. Each lesson includes questions for discussion and review and student activities. A chart is included providing suggested time allocation for each lesson and suggested teaching notes. (CT)