“…For example, crack cocaine has been associated with trading sex for drugs (Edlin et al, 1994;Marx et al, 1991), and among MSM, nitrites (Ostrow et al, 1990;Ostrow et al, 1993) and methamphetamine (Colfax et al, 2004;Mansergh et al, 2006) may serve as triggers for risky sex. Heroin may reduce sexual interest and ability, while methamphetamine and cocaine are associated with increased sex drive (Zule and Desmond, 1999;Rhodes and Quirk, 1998). Differences in pharmacological effects, situations of use, and reasons for use may lead to different relationships between these drugs and risky sexual activity.…”