Archives of Sexual Behavior

, Volume 45, Issue 6, pp 1357–1372 | Cite as

A National Study of Lesbian, Gay, Bisexual (LGB), and Non-LGB Youth Sexual Behavior Online and In-Person

  • Michele L. YbarraEmail author
  • Kimberly J. Mitchell
Original Paper


Online and in-person sexual behaviors of cisgender lesbian, gay, queer, bisexual, heterosexual, questioning, unsure, and youth of other sexual identities were examined using data from the Teen Health and Technology study. Data were collected online between August 2010 and January 2011 from 5,078 youth 13–18 years old. Results suggested that, depending on sexual identity, between 4–35 % of youth had sexual conversations and 2–24 % shared sexual photos with someone online in the past year. Among the 22 % of youth who had oral, vaginal, and/or anal sex, between 5–30 % met one of their two most recent sexual partners online. Inconsistent condom use was associated with increased odds of meeting one’s most recent partner online for heterosexual adolescent men. For gay and queer adolescent men, having an older partner, a partner with a lifetime history of sexually transmitted infections (STI), and concurrent sex partners were each significantly associated with increased odds of having met one’s most recent sex partner online. None of the examined characteristics significantly predicted meeting one’s most recent sexual partner online versus in-person for heterosexual; bisexual; or gay, lesbian, and queer women. The Internet is not replacing in-person exploration and expression of one’s sexuality and meeting sexual partners online appears to be uncommon in adolescence across sexual identities. Healthy sexuality programming that acknowledges some youth are meeting partners online is warranted, but this should not be a main focal point. Instead, inclusive STI prevention programming that provides skills to reduce risk when engaging in all types of sex is critical.


Adolescence Sexual behavior Internet Lesbian Gay Bisexual 



This project was supported by Award Number R01 HD057191 from the National Institute of Child Health and Human Development. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Child Health and Human Development or the National Institutes of Health. We would like to thank the entire study team from Center for Innovative Public Health Research (formerly Internet Solutions for Kids), the University of New Hampshire, the Gay, Lesbian & Straight Education Network (GLSEN), Latrobe University, and Harris Interactive, who contributed to the planning and implementation of the study; and Ms. Emilie Chen, who assisted with the literature review. Finally, we thank the study participants for their time and willingness to participate in this study.

Conflict of interest

The authors declare that there are no conflicts of interest.


  1. Allison, S., Bauermeister, J. A., Bull, S., Lightfoot, M., Mustanski, B., Shegog, R., & Levine, D. (2012). The intersection of youth, technology, and new media with sexual health: Moving the research agenda forward. Journal of Adolescent Health, 51, 207–212. doi: 10.1016/j.jadohealth.2012.06.012.CrossRefPubMedPubMedCentralGoogle Scholar
  2. Almeida, J., Johnson, R. M., Corliss, H. L., Molnar, B. E., & Azrael, D. (2009). Emotional distress among LGBT youth: The influence of perceived discrimination based on sexual orientation. Journal of Youth and Adolescence, 38, 1001–1014. doi: 10.1007/s10964-009-9397-9.CrossRefPubMedPubMedCentralGoogle Scholar
  3. Arrington-Sanders, R., Leonard, L., Brooks, D., Celentano, D., & Ellen, J. (2013). Older partner selection in young African-American men who have sex with men. Journal of Adolescent Health, 52, 682–688. doi: 10.1016/j.jadohealth.2012.12.011.CrossRefPubMedPubMedCentralGoogle Scholar
  4. Bailey, J., Steeves, V., Burkell, J., & Regan, P. (2013). Negotiating with gender stereotypes on social networking sites: From “Bicycle Face” to Facebook. Journal of Communication Inquiry, 37, 91–112. doi: 10.1177/0196859912473777.CrossRefGoogle Scholar
  5. Bauermeister, J. A., Giguere, R., Carballo-Diéguez, A., Ventuneac, A., & Eisenberg, A. (2010). Perceived risks and protective strategies employed by young men who have sex with men (YMSM) when seeking online sexual partners. Journal of Health Communication, 15, 679–690. doi: 10.1080/10810730.2010.499597.CrossRefPubMedPubMedCentralGoogle Scholar
  6. Benotsch, E. G., Kalichman, S., & Cage, M. (2002). Men who have met sex partners via the internet: Prevalence, predictors, and implications for HIV prevention. Archives of Sexual Behavior, 31, 177–183.CrossRefPubMedGoogle Scholar
  7. Bolding, G., Davis, M., Hart, G., Sherr, L., & Elford, J. (2005). Gay men who look for sex on the Internet: Is there more HIV/STI risk with online partners? AIDS, 19, 961–968.CrossRefPubMedGoogle Scholar
  8. Bolding, G., Davis, M., Hart, G., Sherr, L., & Elford, J. (2006). Heterosexual men and women who seek sex through the Internet. International Journal of STD and AIDS, 17, 530–534. doi: 10.1258/095646206778145695.CrossRefPubMedGoogle Scholar
  9. Bull, S. S., McFarlane, M., & Rietmeijer, C. A. (2001). HIV and sexually transmitted infection risk behaviors among men seeking sex with men on-line. American Journal of Public Health, 91, 988–989.CrossRefPubMedPubMedCentralGoogle Scholar
  10. Cass, V. C. (1979). Homosexual identity formation: A theoretical model. Journal of Homosexuality, 4, 219–235.CrossRefPubMedGoogle Scholar
  11. Centers for Disease Control and Prevention. (2011a). HIV among youth. Retrieved from
  12. Centers for Disease Control and Prevention. (2011b). HIV and Other STD Prevention and United States Students. Retrieved from
  13. Centers for Disease Control and Prevention. (2013). Compendium of Evidence-Based HIV Behavioral Interventions: Risk Reduction Chapter. Retrieved from
  14. Chiasson, M. A., Hirshfield, S., Remien, R. H., Humberstone, M., Wong, T., & Wolitski, R. J. (2007). A comparison of on-line and off-line sexual risk in men who have sex with men: An event-based on-line survey. Journal of Acquired Immune Deficiency Syndromes, 44, 235–243. doi: 10.1097/QAI.0b013e31802e298c.CrossRefPubMedGoogle Scholar
  15. Crockett, L. J., Raffaelli, M., & Moilanen, K. (2003). Adolescent Sexuality: Behavior and Meaning. In G. R. Adams & M. D. Berzonsky (Eds.), Blackwell handbook of adolescence (pp. 371–392). Oxford: Blackwell Publishing.Google Scholar
  16. Dehaan, S., Kuper, L. E., Magee, J. C., Bigelow, L., & Mustanski, B. S. (2013). The interplay between online and offline explorations of identity, relationships, and sex: A mixed-methods study with LGBT youth. Journal of Sex Research, 50, 421–434. doi: 10.1080/00224499.2012.661489.CrossRefPubMedGoogle Scholar
  17. Diamond, L. M. (2006). What we got wrong about sexual identity development: Unexpected findings from a longitudinal study of young women. In A. M. Omoto & H. S. Kurtzman (Eds.), Sexual orientation and mental health: Examining identity and development in lesbian, gay, and bisexual people. Contemporary perspectives on lesbian, gay, and bisexual psychology (Vol. 9, pp. 73–94). Washington, DC: American Psychological Association.CrossRefGoogle Scholar
  18. Dodge, B., & Sandfort, T. (2007). A review of mental health research on bisexual individuals when compared to homosexual and heterosexual individuals. In B. Firestein (Ed.), Becoming visible: Counseling bisexuals across the lifespan (pp. 28–51). New York: Columbia University Press.Google Scholar
  19. Elford, J., Bolding, G., & Sherr, L. (2001). Seeking sex on the Internet and sexual risk behaviour among gay men using London gyms. AIDS, 15, 1409–1415.CrossRefPubMedGoogle Scholar
  20. Fethers, K., Marks, C., Mindel, A., & Estcourt, C. S. (2000). Sexually transmitted infections and risk behaviours in women who have sex with women. Sexually Transmitted Infections, 76, 345–349. doi: 10.1136/sti.76.5.345.CrossRefPubMedPubMedCentralGoogle Scholar
  21. Friedman, M., Dodge, B., Schick, V., Herbenick, D., Hubach, R., Bowling, J., et al. (2014). From bias to bisexual health disparities: Attitudes toward bisexual men and women in the United States. LGBT Health,. doi: 10.1089/lgbt.2014.0005.PubMedPubMedCentralGoogle Scholar
  22. Garofalo, R., Herrick, A., Mustanski, B. S., & Donenberg, G. R. (2007). Tip of the iceberg: Young men who have sex with men, the internet, and HIV risk. American Journal of Public Health, 97, 1113–1117. doi: 10.2105/ajph.2005.075630.CrossRefPubMedPubMedCentralGoogle Scholar
  23. Glosser, A., Gardiner, K., & Fishman, M. (2004). Statutory rape: A guide to state laws and reporting requirements. Falls Church, VA: Lewin Group. Retrieved from
  24. Goodenow, C., Szalacha, L. A., Robin, L. E., & Westheimer, K. (2008). Dimensions of sexual orientation and HIV-related risk among adolescent females: Evidence from a statewide survey. American Journal of Public Health, 98, 1051–1058. doi: 10.2105/AJPH.2005.080531.CrossRefPubMedPubMedCentralGoogle Scholar
  25. Harris Interactive & GLSEN. (2005). From teasing to torment: School climate in America, a survey of students and teachers. New York, NY: GLSEN. Retrieved from
  26. Hillier, L., & Harrison, L. (2007). Building realities less limited than their own: Young people practising same-sex attraction on the Internet. Sexualities, 10, 82–100. doi: 10.1177/1363460707072956.CrossRefGoogle Scholar
  27. Hillier, L., Mitchell, K. J., & Ybarra, M. L. (2012). The Internet as a safety net: Findings from a series of online focus groups with LGB and non-LGB young people in the U.S. Journal of LGBT Youth, 9, 225–246. doi: 10.1080/19361653.2012.684642.CrossRefGoogle Scholar
  28. Hines, D. A., & Finkelhor, D. (2007). Statutory sex crime relationships between juveniles and adults: A review of social scientific research. Aggression and Violent Behavior, 12, 300–314.CrossRefGoogle Scholar
  29. Horvath, K., Bowen, A., & Williams, M. (2006). Virtual and physical venues as contexts for HIV risk among rural men who have sex with men. Health Psychology, 25, 237–242.CrossRefPubMedGoogle Scholar
  30. Horvath, K. J., Rosser, B. R. S., & Remafedi, G. (2008). Sexual risk taking among young internet-using men who have sex with men. American Journal of Public Health, 98, 1059–1067.CrossRefPubMedPubMedCentralGoogle Scholar
  31. Houck, C. D., Barker, D., Rizzo, C., Hancock, E., Norton, A., & Brown, L. K. (2014). Sexting and sexual behavior in at-risk adolescents. Pediatrics, 133, e276–e282. doi: 10.1542/peds.2013-1157.CrossRefPubMedPubMedCentralGoogle Scholar
  32. Kapidzic, S., & Herring, S. C. (2011). Gender, communication, and self-presentation in teen chatrooms revisited: Have patterns changed? Journal of Computer-Mediated Communication, 17, 39–59. doi: 10.1111/j.1083-6101.2011.01561.x.CrossRefGoogle Scholar
  33. Kim, A. A., Kent, C., McFarland, W., & Klausner, J. D. (2001). Cruising on the Internet highway. Journal of Acquired Immune Deficiency Syndromes, 28, 89–93.CrossRefPubMedGoogle Scholar
  34. Kivran-Swaine, F., & Naaman, M. (2014). Gender and social sharing of emotions in large-scale social awareness streams. In C. von Scheve & M. Salmela (Eds.), Collective emotions: Perspectives from psychology, philosophy, and sociology (pp. 422–436). New York: Oxford University Press.CrossRefGoogle Scholar
  35. Kosciw, J., & Diaz, E. M. (2006). The 2005 National School Climate Survey: The experiences of lesbian, gay, bisexual, and transgender youth in our nation’s schools. New York, NY: GLSEN. Retrieved from
  36. Kosciw, J. G., Greytak, E. A., Bartkiewicz, M. J., Boesen, M. J., & Palmer, N. A. (2012). The 2011 National School Climate Survey: The experiences of lesbian, gay, bisexual, and transgender youth in our nation’s schools. New York, NY: GLSEN. Retrieved from
  37. Kubicek, K., Beyer, W., Weiss, G., Iverson, E., & Kipke, M. D. (2010). In the dark: Young men’s stories of sexual initiation in the absence of relevant sexual health information. Health Education & Behavior, 37, 243–263. doi: 10.1177/1090198109339993.CrossRefGoogle Scholar
  38. Kubicek, K., Carpineto, J., McDavitt, B., Weiss, G., & Kipke, M. D. (2011). Use and perceptions of the Internet for sexual information and partners: A study of young men who have sex with men. Archives of Sexual Behavior, 40, 803–816. doi: 10.1007/s10508-010-9666-4.CrossRefPubMedGoogle Scholar
  39. Lenhart, A. (2012). Teens, smartphones & texting: Pew Internet & American Life Project. Retrieved from
  40. Lewnard, J. A., & Berrang-Ford, L. (2014). Internet-based partner selection and risk for unprotected anal intercourse in sexual encounters among men who have sex with men: A meta-analysis of observational studies. Sexually Transmitted Infections, 90, 290–296. doi: 10.1136/sextrans-2013-051332.CrossRefPubMedGoogle Scholar
  41. Leynaert, B., Downs, A. M., & de Vincenzi, I. (1998). Heterosexual transmission of human immunodeficiency virus: Variability of infectivity throughout the course of infection. European Study Group on Heterosexual Transmission of HIV. American Journal of Epidemiology, 148, 88–96.CrossRefPubMedGoogle Scholar
  42. Liau, A., Millet, G., & Marks, G. (2006). Meta-analytic examination of online sex-seeking and sexual risk behavior among men who have sex with men. Sexually Transmitted Diseases, 33, 576–584. doi: 10.1097/01.olq.0000204710.35332.c5.CrossRefPubMedGoogle Scholar
  43. Macdonald, N., Sullivan, A. K., French, P., White, J. A., Dean, G., Smith, A., et al. (2014). Risk factors for rectal lymphogranuloma venereum in gay men: Results of a multicentre case-control study in the UK. Sexually Transmitted Infections, 90, 262–268. doi: 10.1136/sextrans-2013-051404.CrossRefPubMedPubMedCentralGoogle Scholar
  44. Madden, M., Lenhart, A., Duggan, M., Cortesi, S., & Gasser, U. (2013, March 13). Teens and technology 2013. Retrieved from
  45. Magnuson, M. J., & Dundes, L. (2008). Gender differences in “social portraits” reflected in MySpace profiles. Cyberpsychology & Behavior, 11, 239–241. doi: 10.1089/cpb.2007.0089.CrossRefGoogle Scholar
  46. Markow, D., Dickson, R. B., & Lee, H. (2011). Online benefits and risks study: Quantitative methodology report. New York, NY: Harris Interactive. Retrieved from
  47. Marrazzo, J. M., Coffey, P., & Bingham, A. (2005). Sexual practices, risk perception and knowledge of sexually transmitted disease risk among lesbian and bisexual women. Perspectives on Sexual and Reproductive Health, 37, 6–12. doi: 10.1363/370605.CrossRefPubMedPubMedCentralGoogle Scholar
  48. McGowan, I. (2011). Rectal microbicides: Can we make them and will people use them? AIDS and Behavior, 15, S66–S71. doi: 10.1007/s10461-011-9899-9.CrossRefPubMedPubMedCentralGoogle Scholar
  49. Mettey, A., Crosby, R., DiClemente, R. J., & Holtgrave, D. R. (2003). Associations between internet sex seeking and STI associated risk behaviours among men who have sex with men. Sexually Transmitted Infections, 79, 466–468.CrossRefPubMedPubMedCentralGoogle Scholar
  50. Mitchell, K. J., Finkelhor, D., & Wolak, J. (2007). Youth internet users at risk for the most serious online sexual solicitations. American Journal of Preventive Medicine, 32, 532–537. doi: 10.1016/j.amepre.2007.02.001.CrossRefPubMedGoogle Scholar
  51. Mitchell, K. J., & Jones, L. M. (2011). Youth Internet Safety (YISS) Study: Methodology report. Durham, NH: Crimes Against Children Research Center, University of New Hampshire. Retrieved from
  52. Mitchell, K. J., Jones, L. M., Finkelhor, D., & Wolak, J. (2013). Understanding the decline in unwanted online sexual solicitations for U.S. youth 2000-2010: Findings from three Youth Internet Safety Surveys. Child Abuse & Neglect, 37, 1225–1236. doi: 10.1016/j.chiabu.2013.07.002.CrossRefGoogle Scholar
  53. Mitchell, K. J., Ybarra, M. L., & Korchmaros, J. (2014). Sexual harassment among adolescents of different sexual orientations and gender identities. Child Abuse and Neglect, 38, 280–295. doi: 10.1016/j.chiabu.2013.09.008.CrossRefPubMedGoogle Scholar
  54. Montcalm, D. M., & Myer, L. L. (2000). Lesbian immunity from HIV/AIDS: Fact or fiction? Journal of Lesbian Studies, 4, 131–147. doi: 10.1300/J155v04n02_09.CrossRefGoogle Scholar
  55. Mustanski, B. S. (2007). Are sexual partners met online associated with HIV/STI risk behaviours? Retrospective and daily diary data in conflict. AIDS Care, 19, 822–827. doi: 10.1080/09540120701237244.CrossRefPubMedGoogle Scholar
  56. Mustanski, B. S., Lyons, T., & Garcia, S. (2011a). Internet use and sexual health of young men who have sex with men: A mixed-methods study. Archives of Sexual Behavior, 40, 289–300. doi: 10.1007/s10508-009-9596-1.CrossRefPubMedGoogle Scholar
  57. Mustanski, B. S., Newcomb, M. E., & Clerkin, E. M. (2011b). Relationship characteristics and sexual risk-taking in young men who have sex with men. Health Psychology, 30, 597–605. doi: 10.1037/a0023858.CrossRefPubMedPubMedCentralGoogle Scholar
  58. Mustanski, B. S., Newcomb, M. E., Du Bois, S. N., Garcia, S. C., & Grov, C. (2011c). HIV in young men who have sex with men: A review of epidemiology, risk and protective factors, and interventions. Journal of Sex Research, 48, 218–253. doi: 10.1080/00224499.2011.558645.CrossRefPubMedPubMedCentralGoogle Scholar
  59. Petersen, A. C. (1988). Adolescent development. Annual Review of Psychology, 39, 583–607. doi: 10.1146/annurev.psych.39.1.583.CrossRefPubMedGoogle Scholar
  60. Pew Research Center. (2013, May 21). What teens share on social media. Retrieved from
  61. Ponton, L. E., & Judice, S. (2004). Typical adolescent sexual development. Child and Adolescent Psychiatric Clinics of North America, 13, 497–511. doi: 10.1016/j.chc.2004.02.003.CrossRefPubMedGoogle Scholar
  62. Remafedi, G., Resnick, M. D., Blum, R., & Harris, L. (1992). Demography of sexual orientation in adolescents. Pediatrics, 89, 714–721. doi: 10.1016/0197-0070(91)90473-Y.PubMedGoogle Scholar
  63. Rice, E., Rhoades, H., Winetrobe, H., Sanchez, M., Montoya, J., Plant, A., & Kordic, T. (2012). Sexually explicit cell phone messaging associated with sexual risk among adolescents. Pediatrics, 130, 667–673. doi: 10.1542/peds.2012-0021.CrossRefPubMedPubMedCentralGoogle Scholar
  64. Rosario, M., Hunter, J., Maguen, S., Gwadz, M., & Smith, R. (2001). The coming-out process and its adaptational and health-related associations among gay, lesbian, and bisexual youths: Stipulation and exploration of a model. American Journal of Community Psychology, 29, 133–160. doi: 10.1023/A:1005205630978.CrossRefPubMedGoogle Scholar
  65. Rosario, M., Meyer-Bahlburg, H. F. L., Hunter, J., Exner, T. M., Gwadz, M., & Keller, A. M. (1996). The psychosexual development of urban lesbian, gay, and bisexual youths. The Journal of Sex Research, 33, 113–126. doi: 10.1080/00224499609551823.CrossRefGoogle Scholar
  66. Rosario, M., Meyer-Bahlburg, H. F. L., Hunter, J., & Gwadz, M. (1999). Sexual risk behavior of gay, lesbian, and bisexual youths in New York City: Prevalence and correlates. AIDS Education and Prevention, 11, 476–496.PubMedGoogle Scholar
  67. Rotheram-Borus, M. J., Marelich, W. D., & Srinivasan, S. (1999). HIV risk among homosexual, bisexual, and heterosexual male and female youths. Archives of Sexual Behavior, 28, 159–177. doi: 10.1023/A:1018719922709.CrossRefPubMedGoogle Scholar
  68. Russell, S. T., Clarke, T. J., & Clary, J. (2009). Are teens “post-gay”? Contemporary adolescents’ sexual identity labels. Journal of Youth and Adolescence, 38, 884–890. doi: 10.1007/s10964-008-9388-2.CrossRefPubMedGoogle Scholar
  69. Sacco, D., Argudin, R., Maguire, J., & Tallon, K. (2010). Sexting: Youth practices and legal implications. Berkman Center Research Publication, 2010-8. doi:  10.2139/ssrn.1661343.
  70. Saewyc, E., Skay, C., Richens, K., Reis, E., Poon, C., & Murphy, A. (2006). Sexual orientation, sexual abuse, and HIV-risk behaviors among adolescents in the Pacific Northwest. American Journal of Public Health, 96, 1104–1110. doi: 10.2105/AJPH.2005.065870.CrossRefPubMedPubMedCentralGoogle Scholar
  71. Savin-Williams, R. C. (1990). Gay and lesbian youth: Expressions of identity. New York: Hemisphere.Google Scholar
  72. Savin-Williams, R. C. (2005). The new gay teenager. Cambridge, MA: Harvard University Press.CrossRefGoogle Scholar
  73. StataCorp. (2009). Stata statistical software: Release 11 [Computer program]. College Station, TX: StataCorp LP.Google Scholar
  74. Temple, J. R., Paul, J. A., van den Berg, P., Le, V., McElhany, A., & Temple, B. W. (2012). Teen sexting and its association with sexual behaviors. Archives of Pediatrics and Adolescent Medicine, 166, 828–833. doi: 10.1001/archpediatrics.2012.835.CrossRefPubMedPubMedCentralGoogle Scholar
  75. Thoma, B. C., Huebner, D. M., & Rullo, J. E. (2013). Unseen risks: HIV-related risk behaviors among ethnically diverse sexual minority adolescent females. AIDS Education and Prevention, 25, 535–541. doi: 10.1521/aeap.2013.25.6.535.CrossRefPubMedGoogle Scholar
  76. Troiden, R. R. (1993). The formation of homosexual identities. In L. D. Garnets & D. C. Kimmel (Eds.), Psychological perspectives on lesbian and gay male experiences (pp. 191–217). New York: Columbia University Press.Google Scholar
  77. United States Census Bureau. (2009). Current population survey: Population estimates, vintage 2009, national tables. Retrieved from
  78. Vittinghoff, E., Douglas, J., Judson, F., McKirnan, D., MacQueen, K., & Buchbinder, S. P. (1999). Per-contact risk of human immunodeficiency virus transmission between male sexual partners. American Journal of Epidemiology, 150, 306–311.CrossRefPubMedGoogle Scholar
  79. White, J. M., Mimiaga, M. J., Reisner, S. L., & Mayer, K. H. (2013). HIV sexual risk behavior among Black men who meet other men on the Internet for sex. Journal of Urban Health, 90, 464–481. doi: 10.1007/s11524-012-9701-y.CrossRefPubMedGoogle Scholar
  80. Wolak, J., Finkelhor, D., Mitchell, K. J., & Ybarra, M. (2008). Online “predators” and their victims: Myths, realities, and implications for prevention and treatment. American Psychologist, 63, 111–128. doi: 10.1037/0003-066X.63.2.111.CrossRefPubMedGoogle Scholar
  81. Wolak, J., Ybarra, M. L., Mitchell, K. J., & Finkelhor, D. (2007). Current research knowledge about adolescent victimization on the internet. Adolescent Medicine State of the Art Reviews, 18, 325–341.PubMedGoogle Scholar
  82. Ybarra, M. L., & Mitchell, K. J. (2014). “Sexting” and its relation to sexual activity and sexual risk behavior in a national survey of adolescents. Journal of Adolescent Health. doi: 10.1016/j.jadohealth.2014.07.012.Google Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Center for Innovative Public Health ResearchSan ClementeUSA
  2. 2.Crimes Against Children Research CenterUniversity of New HampshireDurhamUSA

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