Our Bodies, Ourselves began as a pamphlet on women's health in the early 1970s, but soon became the go-to textbook for every young (and old) person with questions about anything to do with puberty, sex, even relationships. The book has been released and updated in numerous editions over the decades, but all good things must come to an end; the non-profit responsible for OBOS has just announced that they are shifting to a volunteer-only model, which means that updates will be few and far between.