title: High rates of unprotected sex and serosorting among men who have sex with men: a national online study in Norway.
abstract: Unprotected sexual contact between men remains the predominant means of HIV transmission in men.
  
  
  OBJECTIVE
  To ascertain predictors of unprotected anal intercourse between non-primary partners among a sample of 2096 men who have sex with men in Norway and to characterise the sociosexual profile of men who have sex with men who engage in this behaviour.
  
  
  METHODS
  A cross-sectional survey, using an anonymous self-administered questionnaire, was conducted in 2010.
  
  
  RESULTS
  Multivariate logistic regression showed that the likelihood of engaging in unprotected anal intercourse with non-primary partners was lower for men over 30 years (OR = 0.60), those with higher education (OR = 0.58), and higher HIV-related knowledge (OR = 0.98). The likelihood of engaging in unprotected anal intercourse with non-primary partners was higher among men who have sex with men reporting that condoms had not been available (OR = 1.58), who had a higher number of non-primary anal intercourse partners (OR = 1.20), and who reported use of party drugs (OR = 2.34). These men were not more likely to test for HIV/sexually transmitted infections, but they were more likely to have been diagnosed with sexually transmitted infections, engage in serosorting, and various other sexual behaviours.
  
  
  CONCLUSIONS
  As we enter the fourth decade of the HIV epidemic, the results for Norwegian men who have sex with men underscore the need for a scaling-up of prevention campaigns, highlighting messages and behavioural strategies that encourage safer sex strategies.
authors.affiliation: Norwegian Knowledge Center for the Health Services, Olavsplass, Oslo, Norway. rigmor.berg@nokc.no
authors.forename: Rigmor C
authors.initials: RC
authors.lastname: Berg
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D015658:HIV Infections / Q000635:transmission; D059147:HIV Serosorting / Q000706:statistics & numerical data*; D018451:Homosexuality, Male / Q000523:psychology*; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D009664:Norway; D012307:Risk Factors; D012309:Risk-Taking; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D047568:Unsafe Sex / Q000706:statistics & numerical data*; D055815:Young Adult