This comprehensive book explains in lucid, assured terms how to practice the fertility awareness method (FAM), a natural, scientifically proven but little-known form of birth control (which is not to be confused with the woefully ineffective "rhythm" method). Author Toni Weschler has been teaching fertility awareness for almost 20 years, and it's only just now gaining in popularity. As the book explains, by using simple fertility signs including peaks in morning body temperature and changes in cervical position and cervical mucus, it's possible to determine when ovulation is taking place.