“…For instance, MTF groups in San Francisco have been shown to engage in riskier sexual behavior-indicated by the number of sex partners in recent history, participation in commercial sex work, and having a primary partner who injected drugs-than men who have sex with men, nontransgender 4 heterosexual women, and women who have sex with women (Gwadz, Clatts, Leonard, & Goldsamt, 2004 ;Nemoto et al, 1999 ;Nemoto, Operario, Keatley, Han, et al, 2004 ;Nemoto, Operario, Keatley, & Villegas, 2004 ;Stephens, Scott, & Braithwaite, 1999 ;Sykes, 1999 ;Valenta, Elias, & Domurat, 1992 ;Weinberg, Shaver, & Williams, 1999). MTF people are also more likely than FTM people to have been incarcerated, homeless, and unemployed; to have engaged in sex work; and to have lower levels of education (Clements-Nolle, Marx, Guzman, & Katz, 2001 ;Kenagy, 2002Kenagy, , 2005Kenagy & Hsieh, 2005 ;Sevelius, Nemoto, Keatley, Ventura, & SenGupta, 2005 ).5…”