Let's talk about your uterus : an introduction to fertility awareness / by Ashley Hartman Annis.

"Looking for an introduction to the menstrual cycle and hormone-free birth control? This is it! Learn about the different phases of the menstrual cycle, how estrogen and progesterone create different fertility signals you can track, differences in phenotypically female & phenotypically male fertility, and how you can track your cycle for hormone-free birth control."--From zinester's website.