HIV diagnoses among
gay and bisexual men (GBM) have been stable or increasing in many countries for over a decade. In some settings, recent reductions in new diagnoses have been attributed to high uptake of HIV pre-exposure prophylaxis (PrEP) 1 and increased uptake of HIV treatment uptake among people diagnosed with HIV. 2 PrEP has been shown to be highly effective in reducing risk of HIV infection among GBM. 3 Despite high effectiveness, in many settings, awareness and uptake of PrEP among GBM at high risk of HIV infection has been low. 4 Anxiety about HIV affects many GBM, 5–7 compromising their emotional well-being and creating barriers to HIV testing. 8 PrEP may alleviate anxiety about HIV transmission. 9
In 2011, the US Centre for Disease Control and Prevention published interim PrEP guidelines, which assisted in identifying people at high risk of HIV, thereby identifying those eligible to access PrEP.
Guidelines for PrEP have been used nationally in Australia and internationally in implementation studies and to assist PrEP-prescribing clinicians. According to Australian guidelines, GBM who report any of the following behaviors are considered at high risk of HIV and deemed eligible to access PrEP: at least 1 episode of condomless anal intercourse (CLAI) with an HIV-positive regular partner not on treatment or with detectable viral load; receptive CLAI with a casual partner; or recent methamphetamine use. GBM who meet any of these criteria are considered at high risk of HIV (herein described as “PrEP-eligible”), 10 whereas GBM who do not meet these criteria are considered at lower risk of HIV (herein described as “PrEP-ineligible”). Given these differences in risk behavior, anxiety about HIV transmission may differ between PrEP-eligible and PrEP-ineligible. 11
Experiencing anxiety was common among GBM in communities impacted by the AIDS epidemic in the 1980s and 1990s.
For many men, fear of HIV transmission led to anxiety about sex with other men, even in situations where transmission was not possible, such as between men in seroconcordant monogamous relationships. 8,12 Many GBM remain anxious about HIV transmission, particularly in relation to CLAI regardless of whether there is a risk of HIV transmission. 8 PrEP may reduce HIV anxiety among GBM, particularly among those who report HIV risk behaviors, such as CLAI. 13–15
Links between PrEP use and lower levels of HIV-related anxiety have been reported. Among GBM attending an HIV testing clinic in Toronto who were willing to use PrEP, a majority of men with high-risk sexual practices (69.8%) wanted to use PrEP to decrease anxiety about getting HIV.
In addition, several qualitative studies among GBM have found that some men anticipated that taking PrEP would reduce their anxiety about sex with HIV-positive partners 6 and found that many PrEP users report feeling safer during sex or reduced HIV anxiety. 16–18 Older PrEP users have reported relief from long-held fears about HIV that they had associated with sex with other men. 19–24 PrEP users have also reported increased sexual pleasure. 23 An Australian study among 242 GBM using PrEP found that 74% reported reduced HIV concern and increased sexual pleasure because of PrEP. 25 A recent longitudinal cohort study followed up men for 24 months and found that among 137 GBM who initiated PrEP, sexual anxiety in general was lower after commencing PrEP. 26 25
Despite qualitative findings that GBM often perceive PrEP as reducing anxiety about HIV risk and one small cohort study finding that PrEP use was associated with reduced sexual anxiety in a small sample of PrEP users, to the best of our knowledge, no studies have measured HIV-specific anxiety in a large sample of PrEP-eligible GBM. We investigate the relationship between PrEP use and HIV-related anxiety among GBM.
The Following Lives Undergoing Change (Flux) Study is a national, online, open-prospective observational study among GBM in Australia. The study protocol has been published in greater detail previously.
In brief, participants were recruited between 2014 and 2018 through gay community websites and online media, Facebook, mobile phone applications, and gay sexual networking websites. Men were eligible to participate in the study if they were at least 16 years and 6 months of age; identified as gay or bisexual, had sex with a man in the past 12 months; and lived in Australia. At enrolment, participant details and online informed consent were obtained from all participants. Participants verified their enrolment through an email receipt at enrolment. No compensation was offered for participation. Ethical approval was provided by the Human Research Ethics Committee of UNSW Sydney. 27 Measures
All questionnaires were completed online using computer-assisted self-interviewing software.
Items included age, education, sexual identity, and self-reported HIV serostatus. HIV-negative/untested men reported use of PrEP. Questions were mostly derived from previous research, and response options were forced choice (checkboxes and radio buttons). 27 28,29
Sexual behaviors in the previous 6 months were reported for sex with casual and regular partners.
Men also reported whether they engaged in group sex. A hierarchy of HIV risk of sexual behavior was based on a previously used classification system, ranging from lowest risk to highest risk, no sexual partners, no anal sex, consistent condom use, insertive-only CLAI, and any R-CLAI. 30 31
Reported behaviors were used to stratify participants as either PrEP-eligible (high-risk of HIV) or PrEP-ineligible (lower risk of HIV) according to the Australian PrEP Guidelines. Those guidelines use a 3-month period to correspond with data collected in Australian clinic and medical settings.
However, the Health in Men Study data that were used to inform the Australian PrEP Guidelines were based on a 6-month time period, 11 which is also commonly used in Australian behavioral research, 28 including in this study. 29
This project neither was a PrEP trial nor was knowledge of or access to PrEP a requirement for joining the study. Participants simply reported their sexual and drug using behaviors during their participation in the study. For those not using PrEP at baseline or thereafter, their behaviors before initiating PrEP were reported without any particular expectations about subsequent circumstances. Based on the behaviors reported, we categorized participants as high or low risk in accordance with the established Australian PrEP Guidelines. Participants were unaware of their subsequent risk categorization, and their own perceived level of HIV risk was not assessed for this analysis.
Social engagement with gay men was assessed using a scale with 2 items (proportion of friends who are gay men and amount of free time spent with gay male friends), with higher scores indicating greater social engagement with gay men.
In 2018, 3 statements measuring the level of anxiety felt regarding HIV transmission were included: After having sex, I sometimes get concerned that I might have done something risky; I sometimes worry about HIV before having sex; or When I'm having sex, HIV tends to come to mind. Men reported how much they agreed or disagreed with these statements on a 6-point Likert scale ranging from 1 (strongly disagree) to 6 (strongly agree) (
Table 1). The sum of these scores formed a measure of HIV anxiety with strong internal consistency (a = 0.820) ( Table 1). TABLE 1.:
HIV Anxiety Items—Factor Analysis
Data were analyzed with SPSS version 25 software (IBM Corp., Armonk, NY). Participants with missing data included in this analysis were recorded accordingly (eg, did not answer). All data were screened, and statistical assumptions were assessed. Categorical variables were analyzed using the Pearson's χ
2 test, and t-tests were used for continuous variables. We used type I error of 5% for these analyses. To assess statistical associations, we used logistic regression models and calculated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) to compare PrEP use among PrEP-eligible men and again among PrEP-ineligible men. Associations with a P value of less than 0.05 in bivariate analyses were included in the multivariate analyses. Associations with a P value of <0.05 were retained in the final model. RESULTS
Participants and Sample
Since 2014, 2878 GBM had enrolled into the Flux Study. Analysis was restricted to GBM who had not tested HIV-positive and responded to the survey in 2018, thereby excluding 1331 respondents. Compared with the 1547 men included in the analysis, the 1331 men (46.3%) excluded from this analysis men were younger (mean age, 34.5 years vs 37.1 years;
P < 0.001) and less likely to have tested for HIV at baseline (20.8% vs 15.6%; P < 0.001). Men who were excluded were less likely to identify as gay or homosexual (6.9% vs 9.6%; P = 0.022) and less likely to report that most of their friends were gay men (26.8% vs 31.7%; P = 0.002). Although the men who were excluded were no more or less likely to report behaviors that met the eligibility criteria for PrEP at baseline, they had higher mean scores on the measure of generalized anxiety than did the 1547 men (5.76 vs 5.08; P = 0.001) included in these analyses.
The mean age of the 1547 men who completed all items on the HIV anxiety scale was 37.1 years (SD 13.1). Most men (90.6%) were identified as gay, whereas 33.3% said most or all of their friends were gay, with 20.5% spending “a lot” of their time with them. Over half (63.7%) had attended university. Most (89.1%) had been tested for HIV. Over two-fifths (43.9%) reported being in a relationship with a regular male partner in the previous 6 months. One quarter (26.2%) had engaged in behaviors in the previous 6 months that meant they were eligible for PrEP: 20.7% reported R-CLAI with casual partners (R-CLAIC); 9.2% reported methamphetamine use; and 1 man reported condomless sex with an HIV-positive regular partner whose viral load was detectable. Over one-third (37.2%) were using PrEP in the previous 6 months.
Half the men (51.6%) agreed that they sometimes had concerns about whether their sexual encounters were “safe,” and 52.5% agreed that they sometimes worried about HIV before sex (
Table 2). One quarter (25.9%) indicated that HIV comes to mind during sex. TABLE 2.:
Characteristics of Sample and HIV Anxiety Measure
Fifteen men (1.0%) “strongly agreed” with all 3 items; 18.6% scored higher than 12 from the maximum of 18. The mean HIV anxiety score was 8.85 (SD = 4.01). Younger men (25 years or younger) had higher HIV anxiety scores, compared with older men (over 50) who had the lowest scores (
P < 0.001; Table 2). Men who were in a regular relationship had lower HIV anxiety scores compared with men who were not in a regular relationship ( P < 0.001). Men who reported any R-CLAIC scored higher on HIV anxiety compared with men who reported no R-CLAIC ( P = 0.033). Neither eligibility for PrEP nor use of PrEP was associated with either generalized anxiety or HIV anxiety. PrEP-Ineligible GBM
We examined differences based on PrEP use separately for PrEP-eligible and PrEP-ineligible subsamples. In a univariate regression, PrEP-ineligible men who used PrEP were older, more likely to be tertiary educated, reported a greater number of sex partners, and were more socially engaged with gay men compared with PrEP-ineligible men not using PrEP. They also scored lower on the measure of generalized anxiety but somewhat higher on HIV anxiety (
Table 3). In multivariable analysis, a greater number of sex partners (aOR = 1.06; 95% CI: = 1.05 to 1.07; P < 0.001) and being more socially engaged with gay men (aOR = 1.40; 95% CI: = 1.27 to 1.55; P < 0.001) were independently associated with PrEP use. Among noneligible men, HIV anxiety was not independently associated with PrEP use. TABLE 3.:
Factors Associated With PrEP Use Among Men Who did Not Meet PrEP Eligibility Criteria
Among PrEP-eligible men, GBM using PrEP were older, more likely to be tertiary educated, and were more socially engaged with gay men, compared with PrEP-eligible men not using PrEP (
Table 4). They also reported more sex partners and scored lower on measures of both generalized anxiety and HIV anxiety. In multivariable analysis, being tertiary educated (aOR = 2.47; 95% CI: = 1.47 to 4.13; P < 0.001), having more sexual partners (aOR = 1.04; 95% CI: = 1.02 to 1.06; P < 0.001), having greater social engagement with other gay men (aOR = 1.40; 95% CI: = 1.19 to 1.65; P < 0.001), and scoring lower on HIV anxiety (aOR = 0.92; 95% CI: = 0.86 to 0.99; P = 0.006) remained independently associated with PrEP use among PrEP-eligible men. TABLE 4.:
Factors Associated With PrEP Use Among Men Who Met PrEP Eligibility Criteria
We assessed the associations between PrEP use and HIV anxiety in a large cohort of Australian GBM. We found that among PrEP-eligible men, PrEP use was associated with lower levels of HIV anxiety compared with PrEP-eligible men who do not use PrEP. Among PrEP-ineligible men, there were no differences observed in HIV anxiety between men who used PrEP and those who did not. These findings may have significant implications for how PrEP is promoted as a HIV-prevention strategy. Reduced HIV anxiety among PrEP-eligible men is a significant peripheral benefit from PrEP use, in addition to protection from HIV infection. Our findings are similar to those reported by studies of GBM in Australia and the USA, which found that HIV concerns and sexual anxiety were lower after GBM had commenced PrEP.
However, in our study, we compared HIV anxiety according to whether men were taking PrEP both for PrEP-eligible and PrEP-ineligible men. 25,26
Among HIV-negative GBM, the anticipation of possible HIV infection has been associated with elevated levels of anxiety
and reduced HIV testing. 15 Among some young GBM, greater symptoms of anxiety are associated with higher rates of receptive and insertive CLAIC. 9 Using PrEP as an HIV-prevention strategy may benefit such men. 33
Before the advent of PrEP for HIV prevention, many HIV-negative and untested men relied on serosorting to limit sex or CLAI to other men with the same serostatus,
and some specifically excluded HIV-positive men when looking for prospective sexual partners. 34 Despite the strong evidence from clinical studies on the effectiveness of maintaining an undetectable HIV viral load in preventing sexual transmission of HIV, 35 less than one-fifth of Australian HIV-negative and untested men surveyed in 2017 believed that HIV treatment was effective in preventing HIV transmission. 36–38 In addition to reducing anxiety among HIV-negative men, increased uptake of PrEP may help to reduce HIV stigma. However, as suggested by Brown et al, 39 realizing the potential of biomedical HIV prevention technologies such as PrEP and treatment as prevention to reduce HIV stigma among communities of GBM is likely to require investment from HIV researchers, policymakers, and program implementers in a multifaceted approach. 40
Among PrEP-ineligible men, those who used PrEP had more partners and were more socially connected to gay men compared with PrEP-ineligible men who did not use PrEP. Although their behavior did not include practices that would have made them eligible for PrEP, they may have nonetheless had concerns about their level of sexual activity as a potential HIV risk factor, which in some cases may have had some foundation. Using PrEP may have helped to alleviate these concerns, but among these PrEP-ineligible men, PrEP use was not associated with reduced HIV anxiety. For some PrEP-ineligible men, their use of PrEP may reflect an underlying anxiety that does not reflect their actual level of risk and which their use of PrEP has been unable to resolve.
Among PrEP-eligible men, those who used PrEP lower anxiety about HIV were independently associated with PrEP use. Men who were using PrEP were more socially connected to other gay men; this may be related to how PrEP was promoted in Australia. As PrEP uptake in Australia has been greatest among GBM,
these men may have been more familiar with PrEP due to their greater connection to other gay men. From 2016, PrEP was made available in large demonstration studies that mainly recruited GBM. There was broad promotion of PrEP to GBM by community organizations in gay media and outdoor advertising, which was concentrated in geographic areas with gay venues and high proportions of gay male residents. 2,3 As PrEP use increased among men living in suburbs with high concentrations of gay men and/or with stronger connections to gay community, men who were more socially engaged with other gay men would have been more likely to know men on PrEP. An Australian study of PrEP use among GBM has found that PrEP users were more likely to know other PrEP users (and HIV-positive men) than men who were not using PrEP. 41 26
In previous analyses, we have found that PrEP-eligible men who initiate PrEP more frequently report CLAIC, as well as greater partner numbers than PrEP-eligible men who do not initiate PrEP use.
A similar finding here reiterates that men who use PrEP tend to engage in higher levels of CLAIC than those who do not use PrEP, even among men who are eligible for PrEP. 42 Elsewhere, we have also reported that men who initiate PrEP express a desire for CLAI both before and after initiating PrEP and that this desire remains unchanged by PrEP initiation. 43 Pre-existing desires for sexual practices that are known to be high risk of HIV transmission may be the cause for some anxiety, particularly for men who seem to engage in such behaviors despite the risk, even if they do so infrequently or inconsistently. However, PrEP use provides protection from HIV and uncouples such protection from the moment of sex, permitting users to engage in desired practices without the threat of HIV infection present. PrEP-eligible men who used PrEP effectively mitigated their HIV risk, and possibly, their anxiety about HIV was also reduced, but this did not apply to PrEP-eligible men who had not initiated PrEP. 44
Although this volunteer, online convenience sample was similar in characteristics and behaviors to those of participants in other samples of Australian GBM, it is unlikely to be representative of all homosexually active men in Australia.
This sample mostly comprised participants highly attached to gay community, and most participants were Anglo-Celtic, Australian born men. In addition, participants who were excluded from the analysis were significantly different on some variables to men who were included. The generalizability of our findings to other locations may be limited by differences between Australia and other countries. The self-reported data used in this study are open to recall and social desirability biases, but we believe deidentified online data collection would have mitigated social desirability bias. Although this cross-sectional analysis found that HIV anxiety is lower among PrEP-eligible men who use PrEP, we could not determine causal relationships. In the context of the rapid increase in PrEP uptake in Australia, data from long-term follow-up will be beneficial to investigate whether lower HIV anxiety predicts PrEP initiation or is an outcome of taking PrEP. Although the PrEP eligibility criteria have been established to identify behaviors that represent high risk of HIV, they may not capture all people at risk. 28,31,32,45,46
As modeling suggests that to achieve sustained population-level impact from PrEP uptake to reduce HIV transmissions among GBM, PrEP uptake needs to be rapid.
We feel that our findings are timely and important for influencing social marketing or other initiatives increase demand for PrEP that could emphasize the potential for PrEP to reduce anxiety among GBM at high risk of HIV. A strength of this study is that participants were not recruited according to their PrEP status or eligibility for PrEP. 46 CONCLUSIONS
Our findings may have implications for how PrEP is promoted as an HIV prevention strategy for people at risk of infection. Reduced anxiety about HIV transmission among men engaging in CLAIC who were eligible for PrEP prescription represents a significant benefit from PrEP use, in addition to protection from HIV infection.
1. Beyrer C, Sullivan P, Sanchez J, et al. The increase in global HIV epidemics in MSM. AIDS. 2013;27:2665–2678.
2. Grulich AE, Guy R, Amin J, et al. Population-level effectiveness of rapid, targeted, high-coverage roll-out of HIV pre-exposure prophylaxis in men who have sex with men: the EPIC-NSW prospective cohort study. Lancet HIV. 2018;5:e629–e637.
3. Chow EP, Medland NA, Denham I, et al. Decline in new HIV diagnoses among MSM in Melbourne. Lancet HIV. 2018;5:e479–e481.
4. Fonner VA, Dalglish SL, Kennedy CE, et al. Effectiveness and safety of oral HIV preexposure prophylaxis for all populations. AIDS. 2016;30:1973–1983.
5. Kirby T, Thornber-Dunwell M. Uptake of PrEP for HIV slow among MSM. Lancet. 2014;383:399–400.
6. Rana J, Wilton J, Fowler S, et al. Trends in the awareness, acceptability, and usage of HIV pre-exposure prophylaxis among at-risk men who have sex with men in Toronto. Can J Public Health. 2018;109:342–352.
7. Eaton LA, Driffin DD, Bauermeister J, et al. Minimal awareness and stalled uptake of pre-exposure prophylaxis (PrEP) among at risk, HIV-negative, black men who have sex with men. AIDS Patient Care STDS. 2015;29:423–429.
8. Odets W. In the Shadow of the Epidemic: Being HIV-Negative in the Age of AIDS. Durham, NC: Duke University Press; 1995.
9. Conway DP, Holt M, Couldwell DL, et al. Barriers to HIV testing and characteristics associated with never testing among
gay and bisexual men
attending sexual health clinics in Sydney. J Int AIDS Soc. 2015;18:20221.
10. Smith DK, Grant RM, Weidle PJ, et al. Interim guidance: preexposure prophylaxis for the prevention of HIV infection in men who have sex with men. MMWR Morb Mortal Wkly Rep. 2011;60:65–68.
11. Wright E, Grulich A, Roy K, et al. Australasian society for HIV, viral hepatitis and sexual health medicine HIV pre-exposure prophylaxis: clinical guidelines. Update April 2018. J Virus Erad. 2018;4:143–159.
12. Turner HA, Hays RB, Coates TJ. Determinants of social support among gay men: the context of AIDS. J Health Soc Behav. 1993;34:37–53.
13. Balán IC, Carballo-Diéguez A, Ventuneac A, et al. Are HIV-negative men who have sex with men and who bareback concerned about HIV infection? Implications for HIV risk reduction interventions. Arch Sex Behav. 2013;42:279–289.
14. Godin G, Naccache H, Pelletier R. Seeking medical advice if HIV symptoms are suspected. Qualitative study of beliefs among HIV-negative gay men. Can Fam Physician. 2000;46:861–868.
15. Starks TJ, Rendina HJ, Breslow AS, et al. The psychological cost of anticipating HIV stigma for HIV-negative
gay and bisexual men
. AIDS Behav. 2013;17:2732–2741.
16. Brooks RA, Landovitz RJ, Kaplan RL, et al. Sexual risk behaviors and acceptability of HIV pre-exposure prophylaxis among HIV-negative
gay and bisexual men
in serodiscordant relationships: a mixed methods study. AIDS Patient Care STDS. 2012;26:87–94.
17. Mitchell JW, Lee J-Y, Woodyatt C, et al. HIV-negative male couples' attitudes about pre-exposure prophylaxis (PrEP) and using PrEP with a sexual agreement. AIDS Care. 2016;28:994–999.
18. Bil JP, van der Veldt WM, Prins M, et al. Motives of Dutch men who have sex with men for daily and intermittent HIV pre-exposure prophylaxis usage and preferences for implementation: a qualitative study. Medicine (Baltimore). 2016;95:e4910.
19. Gafos M, Horne R, Nutland W, et al. The context of sexual risk behaviour among men who have sex with men seeking PrEP, and the impact of PrEP on sexual behaviour. AIDS Behav. 2019;23:1708–1720.
20. Grant R, Koester K. What people want from sex and preexposure prophylaxis. Curr Opin HIV AIDS. 2016;11:3–9.
21. Storholm ED, Volk JE, Marcus JL, et al. Risk perception, sexual behaviors, and PrEP adherence among substance-using men who have sex with men: a qualitative study. Prev Sci. 2017;18:737–747.
22. Koester K, Amico RK, Gilmore H, et al. Risk, safety and sex among male PrEP users: time for a new understanding. Cult Health Sex. 2017;19:1301–1313.
23. Hughes SD, Sheon N, Andrew EV, et al. Body/selves and beyond: men's narratives of sexual behavior on PrEP. Med Anthropol. 2018;37:387–400.
24. Newman PA, Guta A, Lacombe‐Duncan A, et al. Clinical exigencies, psychosocial realities: negotiating HIV pre‐exposure prophylaxis beyond the cascade among gay, bisexual and other men who have sex with men in Canada. J Int AIDS Soc. 2018;21:e25211.
25. Whitfield TH, Jones SS, Wachman M, et al. The impact of pre-exposure prophylaxis (PrEP) use on sexual anxiety, satisfaction, and esteem among
gay and bisexual men
. J Sex Res. 2019;56:1128–1135.
26. Holt M, Lea T, Bear B, et al. Trends in attitudes to and the use of HIV pre-exposure prophylaxis by Australian
gay and bisexual men
, 2011–2017: implications for further implementation from a diffusion of innovations perspective. AIDS Behav. 2019;23:1939–1950.
27. Hammoud MA, Jin F, Degenhardt L, et al. Following Lives Undergoing Change (Flux) study: implementation and baseline prevalence of drug use in an online cohort study of
gay and bisexual men
in Australia. Int J Drug Pol. 2017;41:41–50.
28. Jin F, Crawford J, Prestage GP, et al. Unprotected anal intercourse, risk reduction behaviours, and subsequent HIV infection in a cohort of homosexual men. AIDS. 2009;23:243–252.
29. Holt M, Lea T, Mao L, et al. Community-level changes in condom use and uptake of HIV pre-exposure prophylaxis by
gay and bisexual men
in Melbourne and Sydney, Australia: results of repeated behavioural surveillance in 2013–17. Lancet HIV. 2018;5:e448–e456.
30. Bavinton BR, Duncan D, Grierson J, et al. The meaning of “regular partner”in HIV research among
gay and bisexual men
: implications of an Australian cross-sectional survey. AIDS Behav. 2016;20:1777–1784.
31. Holt M, Lea T, Mao L, et al. Adapting behavioural surveillance to antiretroviral-based HIV prevention: reviewing and anticipating trends in the Australian Gay Community Periodic Surveys. Sex Health. 2017;14:72–79.
32. Kippax S, Campbell D, Van de Ven P, et al. Cultures of sexual adventurism as markers of HIV seroconversion: a case control study in a cohort of Sydney gay men. AIDS Care. 1998;10:677–688.
33. Rosario M, Schrimshaw EW, Hunter J. A model of sexual risk behaviors among young
gay and bisexual men
: longitudinal associations of mental health, substance abuse, sexual abuse, and the coming-out process. AIDS Educ Prev. 2006;18:444–460.
34. Murphy DA, de Wit JB, Donohoe S, et al. The need to know: HIV status disclosure expectations and practices among non-HIV-positive
gay and bisexual men
in Australia. AIDS Care. 2015;27(suppl 1):90–98.
35. Prestage G, Bavinton B, Callander D, et al. Australian
gay and bisexual men
's online preferences about sex with HIV-positive partners. Sex Health. 2017;14:221–228.
36. Cohen MS, Chen YQ, McCauley M, et al. Antiretroviral therapy for the prevention of HIV-1 transmission. New Engl J Med. 2016;375:830–839.
37. Grulich AE, Guy R, Amin J, et al. Population-level effectiveness of rapid, targeted, high-coverage roll-out of HIV pre-exposure prophylaxis in men who have sex with men: the EPIC-NSW prospective cohort study. Lancet HIV. 2018;5:e629–e637.
38. Rodger AJ, Cambiano V, Bruun T, et al. Sexual activity without condoms and risk of HIV transmission in serodifferent couples when the HIV-positive partner is using suppressive antiretroviral therapy. JAMA. 2016;316:171–181.
39. Lea T, Kolstee J, Murphy D, et al. Changing Attitudes to and Engagement with Biomedical HIV Prevention by
Gay and Bisexual Men
: Key Findings from the PrEPARE Project 2017. Sydney, Australia: UNSW Sydney, Centre for Social Research in Health; 2018.
40. Brown G, Leonard W, Lyons A, et al. Stigma, gay men and biomedical prevention: the challenges and opportunities of a rapidly changing HIV prevention landscape. Sex Health. 2017;14:111–118.
41. ACON-NSW. Ending HIV. Sydney, Australia. ACON NSW; 2018. Available at:
. Accessed April 01, 2019.
42. Hammoud MA, Vaccher S, Jin F, et al. HIV pre-exposure prophylaxis (PrEP) uptake among
gay and bisexual men
in Australia and factors associated with the nonuse of PrEP among eligible men: results from a prospective cohort study. J Acquir Immune Defic Syndr. 2019;81:e73–e84.
43. Traeger MW, Schroeder SE, Wright EJ, et al. Effects of pre-exposure prophylaxis for the prevention of human immunodeficiency virus infection on sexual risk behavior in men who have sex with men: a systematic review and meta-analysis. Clin Infect Dis. 2018;67:676–686.
44. Prestage G, Maher L, Grulich A, et al. Brief report: changes in behavior after PrEP initiation among Australian
gay and bisexual men
. J Acquir Immune Defic Syndr. 2019;81:52–56.
45. Hurley M, Prestage G. Intensive sex partying amongst gay men in Sydney. Cult Health Sex. 2009;11:597–610.
46. Kasaie P, Pennington J, Shah MS, et al. The impact of pre-exposure prophylaxis among men who have sex with men: an individual-based model. J Acquir Immune Defic Syndr. 2017;75:175.