title: Pregnancy and the timing of intercourse.
authors.forename: T W
authors.initials: TW
authors.lastname: Hilgers
mesh_terms: D003075:Coitus; D005260:Female; D005306:Fertilization; D006801:Humans; D008297:Male; D012252:Natural Family Planning Methods; D010060:Ovulation; D011247:Pregnancy / Q000706:statistics & numerical data*; D013997:Time Factors