title: Prevalence of high-risk sex among HIV-positive gay and bisexual men: a longitudinal analysis.
abstract: BACKGROUND
  This longitudinal study examined the prevalence and demographic correlates of unprotected insertive and receptive anal intercourse among HIV-positive gay and bisexual men who were aware of their serostatus.
  
  
  METHODS
  Participants (n = 395), sampled randomly at two HIV outpatient clinics in Los Angeles, completed two waves of self-administered questionnaires (separated by approximately 7-9 months) that measured sexual behaviors in the previous 60 days.
  
  
  RESULTS
  The cross-sectional prevalence of unprotected insertive anal intercourse was 11.2% at time 1 and 7.1% at time 2. Longitudinal analysis indicated that nearly 15% of the participants had engaged in that high-risk behavior either at time 1 or time 2 and approximately 4% had engaged in the behavior at each time period. Similar rates of unprotected receptive anal intercourse were observed. These high-risk activities were more prevalent with seropositive and unknown serostatus partners than with seronegative partners. The rate of anal intercourse risk behaviors was higher among asymptomatic men and among those who were exclusively gay.
  
  
  CONCLUSIONS
  The findings demonstrate considerable differences in the prevalence of stable and occasional high-risk sexual behaviors among HIV-positive gay and bisexual men. Simple cross-sectional analyses cannot capture the stability or variation in behavior across time and, thus, may generate misleading conclusions about disease transmission, especially if the partner's HIV serostatus is not considered in the analysis. The findings indicate a need for focused safer-sex interventions for seropositive men. The HIV outpatient clinic is an ideal setting for such interventions.
authors.affiliation: Department of Psychology, University of Southern California, Los Angeles, USA.
authors.forename: S F
authors.initials: SF
authors.lastname: Posner
authors.forename: G
authors.initials: G
authors.lastname: Marks
mesh_terms: D000328:Adult; D001727:Bisexuality / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D006679:HIV Seropositivity / Q000453:epidemiology*; D015497:HIV-1 / Q000276:immunology*; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D008137:Longitudinal Studies; D015141:Los Angeles / Q000453:epidemiology; D008297:Male; D015995:Prevalence; D011897:Random Allocation; D012309:Risk-Taking; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires; D014505:Urban Population / Q000706:statistics & numerical data