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This study describes the complex dynamics of the sexual, economic and social interactions between a group of feminized homosexual men and men who have sex with men and self-identify as heterosexual ('mostaceros'), in lower-income peripheral urban areas of Lima and Trujillo, Peru. The study examined sexual risk between these two groups of men, and the significance of the economic exchanges involved in their sexual interactions. Using a Grounded Theory approach, 23 individual interviews and 7 focus groups were analyzed. The results reveal that cultural, economic and gender factors mold sexual and social relations among a group of men who have sex with men in Peru. Compensated sex is part of the behaviors of these men, reflecting a complicated construction of sexuality based on traditional conceptions of gender roles, sexual identity and masculinity. Several factors (e.g. difficulty in negotiating condom use, low self-esteem, low risk perception, alcohol and drug consumption), in the context of compensated sex, play a role in risk-taking for HIV infection.

Background: The conduct of longitudinal clinical trials must involve effective strategies to retain study participants in order to ensure internal validity, adequate statistical power and generalizability of results., Purpose: In a large trial in Peru, we implemented various retention strategies to maintain high participation rates over time., Methods: Novel participant retention strategies were used to follow highly marginalized populations for two years because traditional locator information, such as telephone numbers and official identification (eg, passport, driver's license, the local equivalent of a social security number) were often unreliable or unavailable. These strategies included detailed preliminary ethnographic research to identify the behaviours of key target groups, approaches to develop strong informal bonds between project staff and participants outside of study settings, and methods to enhance positive participant attitudes towards the study., Results: The overall study retention rate after two years was 84%, even though only 26% of the study populations supplied complete locator information (telephone, address and the names of two friends)., Limitations: The retention strategies used were labour intensive and iterative, which could prove difficult to replicate., Conclusions: The two-year retention rate in this study was sufficient to maintain required sample sizes. The methods used to maintain contact with the populations were labour intensive, low tech and adequate for these populations and could be used to retain study participants in other marginalized, urban, low-income areas.