“…Substance-using MSM are at especially elevated risk for HIV, attributable to having sex under the influence of drugs (Catania et al, 2001; Celentano et al, 2006; Harawa et al, 2008; Koblin et al, 2006; Mansergh et al, 2008; McKirnan, Vanable, Ostrow, & Hope, 2001; Mimiaga et al, 2010), as well as exchanging sex for money or drugs, and lower condom use (Bachmann et al, 2009; Colfax et al, 2005; Crosby, Stall, Paul, Barrett, & Midanik, 1996; Garfein, Metzner, Cuevas, Bousman, & Patterson, 2010; Gorbach, Murphy, Weiss, Hucks-Ortiz, & Shoptaw, 2009; Reisner et al, 2010; F. Rhodes et al, 1999; Semple, Strathdee, Zians, & Patterson, 2010; Stall et al, 2003).…”