“…In the early 1990s, higher levels of social engagement between gay men were associated with the adoption of condom use in response to HIV (Kippax et al, 1992 , 1995 ). Later in the epidemic, higher GSE became associated with the likelihood of reporting condomless anal sex with casual partners (Fergus et al, 2009 ; Foster-Gimbel et al, 2020 ; Van De Ven et al, 2002 ), a higher number of sexual partners (Zablotska et al, 2012 ), binge-drinking (Fisher et al, 2014 ), illicit drug use (Bui et al, 2018 ; Hammoud et al, 2017a , 2018 ), and not consistently using HIV risk reduction strategies, such as strategic positioning or withdrawal, during condomless sex (Kolstee et al, 2020 ). While GSE appears to have become associated with a number of risk factors for HIV in the second and third decades of the HIV epidemic, GSE also continues to be associated with protective factors including HIV testing (Bavinton et al, 2020 ; Keen et al, 2020 ; Lee et al, 2020 ; Van de Ven et al, 2000 ; Zablotska et al, 2012 ) and PrEP uptake (Keen et al, 2020 ).…”