“…Relationships between substance use and risky sex are of particular concern given that MSM tend to have higher rates of substance use than their heterosexual peers (Cochran et al, 2004;Ostrow and Stall, 2008;Stall and Wiley, 1988). Substance use and sexual risk are especially high among MSM while traveling (Bellis et al, 2004;Benotsch et al, 2006aBenotsch et al, , 2006bClift and Forrest, 1999;Crosby et al, 2003;Darrow et al, 2005;Whittier et al, 2005) and at party-oriented vacations (Benotsch et al, 2007;Lee et al, 2004;Mansergh et al, 2001;Mattison et al, 2001;Ross et al, 2003), events attended by gay and bisexual men that were once commonly referred to as "circuit parties." The prevalence of HIV-positive men at these events is also relatively high, ranging from 13% (Patel et al, 2006;Ross et al, 2003) to 25% .…”