A major objective of this book is to provide a convenient source that will aide the interested learner understand: Menstruation (regular and irregular), ovulation, dysmenorrhea and conception. Infertility and sub fertility in males including premature ejaculation and male impotence. How to achieve pregnancy in a childless union, prenatal care, breastfeeding and family planing. Preselection of the sex of a child: Boy or Girl Menopause.