title: Natural family planning. Abstinence unnatural in primates.
authors.forename: S F
authors.initials: SF
authors.lastname: Crane
authors.forename: M
authors.initials: M
authors.lastname: Potts
mesh_terms: D000818:Animals; D002835:Christianity; D005193:Family Planning Services / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D011323:Primates; D012746:Sexual Abstinence