This is a book of many questions and some answers. What is this menstruation that half the world undergoes? Has it any use, or any purpose? Which is it, blessing or curse? This groundbreaking study of the facts, fantasies, and taboos surrounding menstruation has helped bring about a profound shift in attitudes toward a natural phenomenon that has been reviled and denigrated over the centuries. Thoroughly researched yet highly readable, combining psychology, anthropology, and poetry, Shuttle and Redgrove illustrate their theories using examples ranging from the Bible to such modern-day pop horrors as vampire movies and the cult film The Exorcist.