title: Ages of physical maturation and first intercourse in black teenage males and females.
mesh_terms: D000293:Adolescent; D001741:Black or African American; D000367:Age Factors; D003075:Coitus; D003710:Demography; D005260:Female; D006801:Humans; D008297:Male; D008572:Menarche; D011627:Puberty; D014481:United States