Progesterone Receptors and Opportunities for Contraception -- Reproductive Tissue-Selective Actions of Progesterone Receptors -- The Progesterone Receptor/Estradiol Receptor Association and the Progestin-Triggered S-Phase Entry -- Endometrial Morphology and Progestogens -- Role of Progesterone in the Structural and Biochemical Remodeling of the Primate Endometrium -- Effects of Progestogens on …