1. Halpern CT et al., Adolescent predictors of emerging adult sexual patterns, Journal of Adolescent Health, 2006, doi: 10.1016/‐j.jadohealth.2006.08.005, accessed Aug. 7, 2012.
2. Fortenberry JD et al., Sexual behaviors and condom use at last vaginal intercourse: a national sample of adolescents ages 14 to 17 years, Journal of Sexual Medicine, 2010, 7(5, Suppl):S305–S314.
3. Herbenick D et al., Sexual behavior in the United States: results from a national probability sample of men and women ages 14–94, Journal of Sexual Medicine, 2010, 7(5, Suppl):S255–S265.
4. Weinstock H, Berman S and Cates W, Jr., Sexually transmitted diseases among American youth: incidence and prevalence estimates, 2000, Perspectives on Sexual and Reproductive Health, 2004, 36(1):6–10.
5. Centers for Disease Control and Prevention (CDC), Racial disparities in nationally notifiable diseases—United States, 2002, Morbidity and Mortality Weekly Report, 2005, 54(1):9–11.
6. CDC, Sexually Transmitted Disease Surveillance 2009, Atlanta: U.S. Department of Health and Human Services, 2010.
7. O'Donnell BL, O'Donnell CR and Stueve A, Early sexual initiation and subsequent sex‐related risks among urban minority youth: the Reach for Health study, Family Planning Perspectives, 2001, 33(6):268–275.
8. Upchurch DM et al., Social and behavioral determinants of self‐reported STD among adolescents, Perspectives on Sexual and Reproductive Health, 2004, 36(6):276–287.
9. Kaestle CE et al., Young age at first sexual intercourse and sexually transmitted infections in adolescents and young adults, American Journal of Epidemiology, 2005, 161(8):774–780.
10. Scott ME et al., Risky adolescent sexual behaviors and reproductive health in young adulthood, Perspectives on Sexual and Reproductive Health, 2011, 43(2):110–118.
11. Edwards S and Carne C, Oral sex and the transmission of viral STIs, Sexually Transmitted Infections, 1998, 74(1):6–10.
12. Edwards S and Carne C, Oral sex and transmission of non‐viral STIs, Sexually Transmitted Infections, 1998, 74(2):95–100.
13. Stone N et al., Oral sex and condom use among young people in the United Kingdom, Perspectives on Sexual and Reproductive Health, 2006, 38(1):6–12.
14. Leichliter JS et al., Prevalence and correlates of heterosexual anal and oral sex in adolescents and adults in the United States, Journal of Infectious Diseases, 2007, 196(12):1852–1859.
15. Halperin DT, Heterosexual anal intercourse: prevalence, cultural factors, and HIV infection and other health risks, Part I, AIDS Patient Care and STDs, 1999, 13(12):717–730.
16. Halpern‐Felsher BL et al., Oral versus vaginal sex among adolescents: perceptions, attitudes and behavior, Pediatrics, 2005, 115(4):845–851.
17. Hans JD, Gillen M and Akande K, Sex redefined: the reclassification of oral‐genital contact, Perspectives on Sexual and Reproductive Health, 2010, 42(2):74–78.
18. Sanders SA and Reinisch JM, Would you say you “had sex” if…? Journal of the American Medical Association, 1999, 281(3):275–277.
19. Baldwin JI and Baldwin JD, Heterosexual anal intercourse: an understudied, high‐risk sexual behavior, Archives of Sexual Behavior, 2000, 29(4):357–373.
20. Auslander BA et al., Racial/ethnic differences in patterns of sexual behavior and STI risk among sexually experienced adolescent girls, Journal of Pediatric and Adolescent Gynecology, 2009, 22(1):33–39.
21. DiClemente RJ et al., Anal sex is a behavioural marker for laboratory‐confirmed vaginal sexually transmissible infections and HIV‐associated risk among African‐American female adolescents, Sexual Health, 2009, 6(2):111–116.
22. O'Sullivan LF et al., I wanna hold your hand: the progression of social, romantic and sexual events in adolescent relationships, Perspectives on Sexual and Reproductive Health, 2007, 39(2):100–107.
23. Meier A and Allen G, Romantic relationships from adolescence to young adulthood: evidence from the National Longitudinal Study of Adolescent Health, Sociological Quarterly, 2009, 50(2):308–335.
24. Kandel D and Yamaguchi K, From beer to crack: developmental patterns of drug involvement, American Journal of Public Health, 1993, 83(6):851–855.
25. Behrendt S et al., Transitions from first substance use to substance use disorders in adolescence: Is early onset associated with a rapid escalation? Drug and Alcohol Dependence, 2009, 99(1–3):68–78.
26. Moffitt TE, Adolescence‐limited and life‐course‐persistent anti‐social behavior: a developmental taxonomy, Psychological Review, 1993, 100(4):674–701.
27. Zimmer‐Gembeck MJ and Helfand M, Ten years of longitudinal research on U.S. adolescent sexual behavior: developmental correlates of sexual intercourse, and the importance of age, gender and ethnic background, Developmental Review, 2008, 28(2):153–224.
28. de Graaf H et al., Sexual trajectories during adolescence: relation to demographic characteristics and sexual risk, Archives of Sexual Behavior, 2009, 38(2):276–282.
29. Salazar LF et al., African‐American female adolescents who engage in oral, vaginal and anal sex: “doing it all” as a significant marker for risk of sexually transmitted infection, AIDS and Behavior, 2009, 13(1):85–93.
30. Furstenberg F, Jr., et al., Race differences in the timing of adolescent intercourse, American Sociological Review, 1987, 52(4):511–518.
31. Lindberg LD, Jones R and Santelli JS, Noncoital sexual activities among adolescents, Journal of Adolescent Health, 2008, 43(3):231–238.
32. Smith EA and Udry JR, Coital and non‐coital sexual behaviors of white and black adolescents, American Journal of Public Health, 1985, 75(10):1200–1203.
33. Hallfors DD et al., Sexual and drug behavior patterns and HIV and STD racial disparities: the need for new directions, American Journal of Public Health, 2007, 97(1):125–132.
34. Halpern CT et al., Implications of racial and gender differences in patterns of adolescent risk behavior for HIV and other sexually transmitted diseases, Perspectives on Sexual and Reproductive Health, 2004, 36(6):239–247.
35. Harris KM et al., The National Longitudinal Study of Adolescent Health: research design, Chapel Hill, NC: University of North Carolina, 2008, <http://www.cpc.unc.edu/projects/addhealth/design>, accessed Aug. 7, 2012.
36. Haydon AA et al., Beyond age at first sex: patterns of emerging sexual behavior in adolescence and young adulthood, Journal of Adolescent Health, 2012, 50(5):456–463.
37. Finer LB, Darroch JE and Singh S, Sexual partnership patterns as a behavioral risk factor for sexually transmitted diseases, Family Planning Perspectives, 1999, 31(5):228–236.
38. Rosenberg MD et al., Concurrent sex partners and risk for sexually transmitted diseases among adolescents, Sexually Transmitted Diseases, 1999, 26(4):208–212.
39. Jessor R and Jessor SL, Problem Behavior and Psychosocial Development, New York: Academic Press, 1977.
40. Resnick MD et al., Protecting adolescents from harm: findings from the National Longitudinal Study on Adolescent Health, Journal of the American Medical Association, 1997, 278(10):823–832.
41. Harris KM, University of North Carolina, Chapel Hill, personal communication, Apr. 7, 2007.
42. Wilson HW and Widom CS, Sexually transmitted diseases among adults who had been abused and neglected as children: a 30‐year prospective study, American Journal of Public Health, 2009, 99(1, Suppl):S197–S203.
43. Noll JG, Trickett PK and Putnam FW, A prospective investigation of the impact of childhood sexual abuse on the development of sexuality, Journal of Consulting and Clinical Psychology, 2003, 71(3):575–586.
44. Fergusson DM, Horwood LJ and Lynskey MT, Childhood sexual abuse, adolescent sexual behaviors and sexual revictimization, Child Abuse & Neglect, 1997, 21(8):789–803.
45. Brener ND et al., Forced sexual intercourse and associated health‐risk behaviors among female college students in the United States, Journal of Consulting and Clinical Psychology, 1999, 67(2):252–259.
46. Spriggs AL and Halpern CT, Sexual debut timing and depressive symptoms in emerging adulthood, Journal of Youth and Adolescence, 2008, 37(9):1085–1096.
47. Laumann EP and Youm Y, Racial/ethnic group differences in the prevalence of sexually transmitted diseases in the United States: a network explanation, Sexually Transmitted Diseases, 1999, 36(5):250–261.
48. Giordano PC, Manning WD and Longmore MA, Affairs of the heart: qualities of adolescent romantic relationships and sexual behavior, Journal of Research on Adolescence, 2010, 20(4):983–1013.
49. Vrangalova Z and Savin‐Williams RC, Adolescent sexuality and positive well‐being: a group‐norms approach, Journal of Youth and Adolescence, 2011, 40(8):931–944.
50. Pinquart M, Ambivalence in adolescents’ decisions about having their first sexual intercourse, Journal of Sex Research, 2010, 47(5):440–450.
51. Higgins JA et al., Virginity lost, satisfaction gained? Physiological and psychological sexual satisfaction at heterosexual debut, Journal of Sex Research, 2010, 47(4):384–394.
52. Galinsky AM and Sonenstein FL, The association between developmental assets and sexual enjoyment among emerging adults, Journal of Adolescent Health, 2011, 48(6):610–615.
53. Howell M, The History of Federal Abstinence‐Only Funding, Washington, DC: Advocates for Youth, 2007, <http://www.advocatesforyouth.org/index.php?option=com_content&task=view&id=429&Itemid=177>, accessed Aug. 7, 2012.
54. Finer LB, Trends in premarital sex in the United States, 1954–2003, Public Health Reports, 2007, 122(1):73–78.