Human sexual behavior research.
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D005380:Financing, Government; D015658:HIV Infections / Q000453:epidemiology; D006801:Humans; D008875:Middle Aged; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data; D011275:Pregnancy, Unwanted / Q000706:statistics & numerical data; D012106:Research / Q000191:economics / Q000331:legislation & jurisprudence*; D012725:Sexual Behavior; D012958:Societies, Scientific; D014481:United States