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Although illegal, stigmatized and constantly under attack from police, prostitution remains a full-time job for many Chinese women. Interventions to improve sexual health practices among FSW in China tend to assume that women engage in?Springer Science+Business Media New York 2013 Correspondence to: Zhang Youchun, youchun_zhang@126.com.Youchun et al.Pagehigh-risk behaviors because of low knowledge about correct condom use and HIV/STI transmission, and thus focus on education and condom-use skills training [1]. Previous research has shown, however, that while some FSW may continue to rely on ineffective prevention methods such as washing with salt water or disinfectants, [http://nerdmerge.com/activity-streams/p/300224/ S. For profitable scientists, the value of H-index is normally larger] douching, and selfmedicating with antibiotics [5], others are better informed about reproductive health and more skilled in condom use than women outside the sex trade [6]. Yet knowledge does not necessarily translate into safer sexual behaviors even among well-informed FSW [7, 8]. Instead, a variety of factors influence FSWs' choice or ability to practice safer sexual behaviors, including--but not limited to--economic hardship, concerns about fertility, client refusal/coercion, relationship status, and working conditions [8?3]. The relative importance of each of these factors for HIV/STI acquisition may also vary as they operate through the unique characteristics of different settings within the sex work industry [2, 5, 7, 13, 14]. The Chinese Ministry of Health considers FSW a priority population for HIV/STI disease surveillance and prevention activities [15]. However, according to previous ethnographic research [13, 16], at least seven categories of Chinese sex workers exist, differing by workplace, types of services offered, income levels, and demographic characteristics. Recent epidemiologic surveillance data suggests that these differences may play a role in HIV/STI risk among FSW [4]. For example, in a study of 816 FSW, women recruited from streets and rented houses had a syphilis prevalence of 40.7  compared to 11.1  among women recruited from hair salons, saunas and massage shops [2]. Although national estimates of HIV prevalence among FSW remain relatively low ([https://dx.doi.org/10.1037/a0022827 a0022827] industry-level factors [https://dx.doi.org/10.1371/journal.pone.0077579 journal.pone.0077579] place female sex workers (FSW) in China at increased risk for acquiring HIV/AIDS and other sexually transmitted diseases [1?]. Although illegal, stigmatized and constantly under attack from police, prostitution remains a full-time job for many Chinese women.