Robert Guzman

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OBJECTIVES This study described HIV prevalence, risk behaviors, health care use, and mental health status of male-to-female and female-to-male transgender persons and determined factors associated with HIV. METHODS We recruited transgender persons through targeted sampling, respondent-driven sampling, and agency referrals; 392 male-to-female and 123(More)
OBJECTIVES There is evidence that methamphetamine and sildenafil (Viagra) use are associated with sexual risk behaviour among men who have sex with men (MSM). We investigated the association of methamphetamine, sildenafil, and other substance use with unprotected receptive and insertive anal sex among MSM by conducting an encounter specific analysis. (More)
CONTEXT HIV risk behavior among urban gay/bisexual men has recently increased. High-risk sexual activity and drug use may be particularly high during circuit party (CP) weekends, during which gay/bisexual men congregate for social activities and dancing. OBJECTIVES To compare prevalence of risk behaviors during CP weekends with those during non-CP(More)
OBJECTIVES This study examined characteristics of gay and bisexual men who attend circuit parties, frequency of and motivations for attending parties, drug use and sexual behavior during circuit party weekends, and use of risk reduction materials available at parties. METHODS A cross-sectional survey was conducted among 295 gay and bisexual men from the(More)
OBJECTIVES To assess the prevalence of and factors associated with "Barebacking" as a sociocultural phenomenon in a sample of HIV-positive and -negative men who have sex with men (MSM), and to assess the reasons for barebacking and venues for meeting partners. DESIGN A cross-sectional survey of MSM recruited in the San Francisco Bay Area from July 2000 to(More)
Club drug use is common among populations with human immunodeficiency virus (HIV) and populations at high risk for HIV infection. Club drugs have a myriad of acute and chronic medical consequences. Club drug-related visits to the emergency department and admissions for treatment of substance use have increased dramatically over the past 15 years. Most(More)
This study explored the relationship between gay identity-related factors (gay community involvement, gay bar attendance, gay identity importance, and self-homophobia) and unprotected anal sex (UA) in the past 3 months among men who have sex with men (MSM) of three different race/ethnicity groups. Four hundred eighty-three MSM (mean age 34) were recruited(More)
BACKGROUND Research suggests that because of economic necessity, many male-to-female (MTF) transgender individuals trade sex for money, drugs, housing, and other things they may need. To date, no studies have quantitatively assessed psychosocial correlates of condom use with this population. METHODS We conducted a cross sectional study with 190 MTF(More)
OBJECTIVE To examine the prevalence of negotiated safety (NS) in a diverse sample of HIV-negative men who have sex with men (MSM), characteristics of MSM practicing NS, and adherence to NS. METHODS This was a cross-sectional survey of San Francisco MSM recruited from venues and community organizations. NS relationships were defined as those in which(More)