The risk of premarital conception.
D000293:Adolescent; D000328:Adult; D001315:Australia; D003075:Coitus; D003267:Contraception / Q000706:statistics & numerical data; D005191:Family Characteristics; D005260:Female; D005306:Fertilization; D006801:Humans; D007086:Illegitimacy; D008393:Marriage; D009014:Morals; D012725:Sexual Behavior; D013223:Statistics as Topic