title: Present stage of knowledge of reproductive biology concerning natural family planning.
authors.forename: G
authors.initials: G
authors.lastname: Freundl
mesh_terms: D001695:Biology; D005835:Genitalia; D005854:Germ Cells; D019359:Knowledge; D008597:Menstrual Cycle; D008598:Menstruation; D010060:Ovulation; D010827:Physiology; D012098:Reproduction; D013079:Sperm Maturation; D013091:Spermatogenesis; D013094:Spermatozoa; D014566:Urogenital System
keywords: Biology; Genitalia; Germ Cells; Knowledge; Menstrual Cycle; Menstruation; Ovulation; Physiology; Reproduction; Sperm Maturation; Spermatogenesis; Spermatozoa; Urogenital System; World