I have a Dorling Kindersley book,endorsed by the family planning association. It is called How Sex Works. It is a clear, comprehensive guide to growing up physically,emotionally and sexually. It is written by Elizabeth Fenwick and Richard Walker, and covers a variety of subjects ( Understanding your body, Relationships and emotions, what happens during sex, contraception,pregnancy and becoming a parent, sex and health, problem areas and many other subjects) Hope this is of some help.