I saw this movie at a Saturday afternoon matinee in my early teens, and it has stuck with me ever since. It was made in an era where, unlike ours, sex was discussed as a natural part of life. It shows, in fairly graphic detail, the reproductive habits of everything from single-celled bacteria to elephants. And yes, it shows an actual human birth. While many would be offended by the sheer number of aroused animal genitalia shown, the intent of the film is purely educational. This is a film that every healthy, intelligent person should see.