Abstract
Sex with multiple partners, consecutively or concurrently, is a risk factor for contracting sexually transmitted infections (STIs) as multiple partner–partner contacts present increased opportunity for transmission. It is unclear, however, if individuals who tend to have more partners also use protection less reliably than those with sexual histories of fewer partners. Longitudinal data can elucidate whether an individual shows a consistent pattern of sex with multiple partners. We used latent class growth analyses to examine emerging adult survey data (N = 2244) spanning 10 waves of assessment across 6 years. We identified three trajectory classes described with respect to number of partners as (a) Multiple, (b) Single, and (c) Rare. Trajectory group, relationship status, and their interactions were tested as predictors of using protection against STIs and pregnancy at each wave. The Multiple Partners class had the greatest odds ratio of reporting sex without protection against STIs and pregnancy, followed by the Single and Rare classes. Exclusive relationship status was a risk factor for unprotected sex at earlier waves, but a protective factor at most later waves. There was no significant interaction between relationship status and trajectory class in predicting use of protection. The Multiple Partners class reported more permissive values on sex and an elevated proportion of homosexual behavior. This group overlaps with an already identified at-risk population, men who have sex with men. Potential mechanisms explaining the increased risk for sex without protection, including communication, risk assessment, and co-occurring risk behaviors are discussed as targets for intervention.
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Notes
As the topic of this article is sexual intercourse, often called simply “sex,” we use the term “gender” rather than “biological sex” or “sex” when examining differences between males and females in order to avoid confusing and overlapping terminology. The reader should note that although “gender” is used, we mean biological sex.
References
Akaike, H. (1987). Factor analysis and AIC. Psychometrika, 52(3), 317–332.
American College Health Association. (2009). American College Health Association-National College Health Assessment Spring 2008 Reference Group Data Report (abridged): The American College Health Association. Journal of American College Health, 57(5), 477–488. doi:10.3200/JACH.57.5.477-488.
Arnett, J. J. (2000). Emerging adulthood: A theory of development from the late teens through the twenties. American Psychologist, 55(5), 469.
Asparouhov, T., & Muthén, B. (2013). Auxiliary variables in mixture modeling: 3-step approaches using Mplus. Mplus Web Notes, 15, 1–24.
Bogle, K. A. (2008). Hooking up: Sex, dating, and relationships on campus. New York: NYU Press.
Boone, T., & Lefkowitz, E. (2004). Safer sex and the health belief model: Considering the contributions of peer norms and socialization factors. Journal of Psychology & Human Sexuality, 74, 51–68.
Brewster, K. L., & Tillman, K. H. (2008). Who’s doing it? Patterns and predictors of youths’ oral sexual experiences. Journal of Adolescent Health, 42(1), 73–80. doi:10.1016/j.jadohealth.2007.08.010.
Breyer, B. N., Smith, J. F., Eisenberg, M. L., Ando, K. A., Rowen, T. S., & Shindel, A. W. (2010). The impact of sexual orientation on sexuality and sexual practices in North American medical students. Journal of Sexual Medicine, 7(7), 2391–2400.
Brown, J. L., & Vanable, P. A. (2007). Alcohol use, partner type, and risky sexual behavior among college students: Findings from an event-level study. Addictive Behaviors, 32(12), 2940–2952. doi:10.1016/j.addbeh.2007.06.011.
CDC. (2014a). HIV among youth. Retrieved from http://www.cdc.gov/hiv/risk/age/youth/index.html?s_cid=tw_std0141316
CDC. (2014b). STDs in adolescents and young adults. Retrieved from http://www.cdc.gov/std/stats12/adol.htm
CDC. (2015). HIV among gay and bisexual men. Retrieved from http://www.cdc.gov/hiv/risk/gender/msm/facts/index.html
Celeux, G., & Soromenho, G. (1996). An entropy criterion for assessing the number of clusters in a mixture model. Journal of Classification, 13(2), 195–212.
Civic, D. (2000). College students’ reasons for nonuse of condoms within dating relationships. Journal of Sex and Marital Therapy, 26(1), 95–105.
Cooper, M. L., & Orcutt, H. K. (2000). Alcohol use, condom use and partner type among heterosexual adolescents and young adults. Journal of Studies on Alcohol and Drugs, 61(3), 413–419.
Edwards, S., & Carne, C. (1998). Oral sex and transmission of non-viral STIs. Sexually Transmitted Infections, 74(2), 95–100.
Fielder, R. L., Walsh, J. L., Carey, K. B., & Carey, M. P. (2013). Predictors of sexual hookups: A theory-based, prospective study of first-year college women. Archives of Sexual Behavior, 42(8), 1425–1441. doi:10.1007/s10508-013-0106-0.
Gates, G. J. (2011). How many people are lesbian, gay, bisexual and transgender? Retrieved from http://williamsinstitute.law.ucla.edu/wp-content/uploads/Gates-How-Many-People-LGBT-Apr-2011.pdf
Giordano, P. C., Manning, W. D., Longmore, M. A., & Flanigan, C. M. (2012). Developmental shifts in the character of romantic and sexual relationships from adolescence to young adulthood. In A. Booth, S. L. Brown, N. S. Landale, W. D. Wanning, & S. M. McHale (Eds.), Early adulthood in a family context (pp. 133–164). New York: Springer.
Gullette, D. L., & Lyons, M. A. (2005). Sexual sensation seeking, compulsivity, and HIV risk behaviors in college students. Journal of Community Health Nursing, 22(1), 47–60. doi:10.1207/s15327655jchn2201_5.
Hall, N. M., & Pichon, L. C. (2014). Gender roles, sociosexuality, and sexual behavior among US Black women. Health Psychology and Behavioral Medicine, 2(1), 171–182. doi:10.1080/21642850.2014.882236.
Harden, K. P. (2014). A sex-positive framework for research on adolescent sexuality. Perspective on Psychological Science, 9(5), 455–469.
Huang, D. Y., Murphy, D. A., & Hser, Y. I. (2012). Developmental trajectory of sexual risk behaviors from adolescence to young adulthood. Youth & Society, 44(4), 479–499. doi:10.1177/0044118X11406747.
Janz, N. K., & Becker, M. H. (1984). The Health Belief Model: A decade later. Health Education Quarterly, 11(1), 1–47.
Johnston, L. D., O’Malley, P. M., Bachman, J. G., Schulenberg, J. E., Patrick, M. E., & Miech, R. A. (2014). HIV/AIDS: Risk & protective behaviors among adults ages 21 to 40 in the U.S., 2004–2013. Ann Arbor, MI: Institute for Social Research, The University of Michigan.
LaBrie, J., Earleywine, M., Schiffman, J., Pedersen, E., & Marriot, C. (2005). Effects of alcohol, expectancies, and partner type on condom use in college males: Event-level analyses. Journal of Sex Research, 42(3), 259–266. doi:10.1080/00224490509552280.
Lehmiller, J. J., VanderDrift, L. E., & Kelly, J. R. (2014). Sexual communication, satisfaction, and condom use behavior in friends with benefits and romantic partners. Journal of Sex Research, 51(1), 74–85.
Lewis, J. E., Miguez-Burbano, M.-J., & Malow, R. M. (2009). HIV risk behavior among college students in the United States. College Student Journal, 43(2), 475.
Manlove, J., Ikramullah, E., & Terry-Humen, E. (2008). Condom use and consistency among male adolescents in the United States. Journal of Adolescent Health, 43(4), 325–333. doi:10.1016/j.jadohealth.2008.03.008.
Marston, C., & King, E. (2006). Factors that shape young people’s sexual behaviour: A systematic review. Lancet, 368(9547), 1581–1586. doi:10.1016/S0140-6736(06)69662-1.
Martinez, G., Copen, C. E., & Abma, J. C. (2011). Teenagers in the United States: Sexual activity, contraceptive use, and childbearing, 2006–2010 national survey of family growth. Vital and Health Statistics, 23(31), 1–35.
McArdle, J. J., & Nesselroade, J. R. (2003). Growth curve analysis in contemporary psychological research. In J. A. Schinka & W. F. Velicer (Eds.), Handbook of psychology: Research methods in psychology (Vol. 2, pp. 447–480). New York: Wiley.
Meston, C. M., & Ahrold, T. (2010). Ethnic, gender, and acculturation influences on sexual behaviors. Archives of Sexual Behavior, 39(1), 179–189.
Moilanen, K. L., Crockett, L. J., Raffaelli, M., & Jones, B. L. (2010). Trajectories of sexual risk from middle adolescence to early adulthood. Journal of Research on Adolescence, 20(1), 114–139.
Muthén, B., & Muthén, L. K. (2000). Integrating person-centered and variable-centered analyses: Growth mixture modeling with latent trajectory classes. Alcoholism, Clinical and Experimental Research, 24(6), 882–891.
Nagin, D. (2005). Group-based modeling of development. Cambridge, MA: Harvard University Press.
Noar, S. M. (2008). Behavioral interventions to reduce HIV-related sexual risk behavior: Review and synthesis of meta-analytic evidence. AIDS and Behavior, 12(3), 335–353.
Okazaki, S. (2002). Influences of culture on Asian Americans’ sexuality. Journal of Sex Research, 39(1), 34–41. doi:10.1080/00224490209552117.
Ostovich, J. M., & Sabini, J. (2004). How are sociosexuality, sex drive, and lifetime number of sexual partners related? Personality and Social Psychology Bulletin, 30(10), 1255–1266. doi:10.1177/0146167204264754.
Perkins, H. W., & Berkowitz, A. D. (1986). Perceiving the community norms of alcohol use among students: Some research implications for campus alcohol education programming. International Journal of Addiction, 21(9–10), 961–976.
Reisen, C. A., & Poppen, P. J. (1995). College women and condom use: Importance of partner relationship. Journal of Applied Social Psychology, 25(17), 1485–1498.
Rosenberg, M. D., Gurvey, J. E., Adler, N., Dunlop, M. B., & Ellen, J. M. (1999). Concurrent sex partners and risk for sexually transmitted diseases among adolescents. Sexually Transmitted Diseases, 26(4), 208–212.
Santelli, J. S., Brener, N. D., Lowry, R., Bhatt, A., & Zabin, L. S. (1998). Multiple sexual partners among U.S. adolescents and young adults. Family Planning Perspectives, 30(6), 271–275.
Savin-Williams, R. C. (2006). Who’s gay? Does it matter? Current Directions in Psychological Science, 15(1), 40–44.
Schafer, J. L., & Graham, J. W. (2002). Missing data: Our view of the state of the art. Psychological Methods, 7(2), 147–177.
Schwartz, I. M. (1999). Sexual activity prior to coital initiation: A comparison between males and females. Archives of Sexual Behavior, 28(1), 63–69.
Schwarz, G. (1978). Estimating the dimension of a model. Annals of Statistics, 6(2), 461–464.
Sclove, S. L. (1987). Application of model-selection criteria to some problems in multivariate analysis. Psychometrika, 52(3), 333–343.
Townsend, J. M., & Wasserman, T. H. (2011). Sexual hookups among college students: Sex differences in emotional reactions. Archives of Sexual Behavior, 40(6), 1173–1181.
Vuong, Q. H. (1989). Likelihood ratio tests for model selection and non-nested hypotheses. Econometrica, 57, 307–333.
Wetherill, R. R., & Fromme, K. (2007). Perceived awareness and caring influences alcohol use by high school and college students. Psychology of Addictive Behaviors, 21(2), 147.
Wetherill, R. R., Neal, D. J., & Fromme, K. (2010). Parents, peers, and sexual values influence sexual behavior during the transition to college. Archives of Sexual Behavior, 39(3), 682–694.
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We would like to thank Elise Marino, Susan Kirtz, and Dr. Elliot Tucker-Drob for their assistance in the development of this manuscript.
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All listed authors contributed significantly to this article in terms of study design, analysis, and writing. All authors approved the final article. This research was supported by training Grant 5T32 AA7471-28 (Ashenhurst) and NIAAA RO1-AA013967 (Fromme).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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Ashenhurst, J.R., Wilhite, E.R., Harden, K.P. et al. Number of Sexual Partners and Relationship Status Are Associated With Unprotected Sex Across Emerging Adulthood. Arch Sex Behav 46, 419–432 (2017). https://doi.org/10.1007/s10508-016-0692-8
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DOI: https://doi.org/10.1007/s10508-016-0692-8