This is a National Trial Print of an Australian Science Education Project unit entitled Males and Females. Materials provided consist of a teacher's edition of the written materials, a student record book, and seven large black and white photographs showing various stages in the dissection of a pregnant rat. This unit has been written to help students of about 11 to 12 years of age learn about reproduction and human sexuality. This objective is to be achieved primarily by reading the material provided in the core of the unit and the 12 options and by discussing the subject matter both in small groups and as a class under the teacher's guidance. Some additional activities are provided which supplement the reading and discussion. Content areas included are physical differences, growing up, sexual intercourse, fertilization, gestation, birth, care from parents, and social behaviour. Teachers planning to use this unit are advised to contact parents before using the materials with pupils. (PEB)