Brignol Sandra, Dourado Inês
Instituto de Saúde Coletiva, Universidade Federal da Bahia, Salvador, BA, Brasil.
Rev Bras Epidemiol. 2011 Sep;14(3):423-34. doi: 10.1590/s1415-790x2011000300007.
Unprotected anal sex (insertive or receptive) is an important risk factor for HIV infection and other STDs.
The objective was to investigate individual and social factors associated with unprotected anal sex among Men Who have Sex with Men (MSM) that declared being HIV negative and engaged in anal sex with an HIV positive partner or of ignored serology.
This study is part of a survey among MSM and among Internet users, with data collected from an on line questionnaire in project site. The internet sample for this study was 487 MSM. Descriptive and stratified analyses were carried out and χ² test was used. Logistic regression was used for modeling the data.
Among the participants 30.8% referred unprotected anal sex in the previous 12 months with an HIV positive partner or partner with unknown serology. Most of them belonged to higher social classes, were white and single. Factors associated with unprotected anal sex were: number of partners (more than 3) in the previous 12 months (OR=1.7; 95% CI 1.1-2.7), high or medium perception of risk to HIV/Aids (OR=2.7; 95% CI 1.5-3.6) and enjoy passive oral sex (OR=0.3; 95% CI 0.2-0.8).
Unprotected anal sex was a frequent practice among MSM in this survey. The frequency to public bathrooms should be further explored as a risk factor for unprotected anal sex. It is important to further explore these findings in order to understand these relationships and the involvement in risky sexual practices for HIV infection among MSM.
无保护肛交（插入式或接受式）是感染艾滋病毒和其他性传播疾病的重要风险因素。
本研究旨在调查与男男性行为者（MSM）中无保护肛交相关的个人和社会因素，这些男男性行为者宣称自己艾滋病毒检测呈阴性，且与艾滋病毒呈阳性的伴侣进行肛交或忽视血清学检测结果。
本研究是对男男性行为者和互联网用户进行的一项调查的一部分，数据通过项目网站上的在线问卷收集。本研究的互联网样本为487名男男性行为者。进行了描述性和分层分析，并使用了χ²检验。采用逻辑回归对数据进行建模。
在参与者中，30.8%的人表示在过去12个月内与艾滋病毒呈阳性的伴侣或血清学检测结果未知的伴侣进行过无保护肛交。他们中的大多数属于较高社会阶层，为白人且单身。与无保护肛交相关的因素有：过去12个月内的性伴侣数量（超过3个）（比值比=1.7；95%置信区间1.1 - 2.7）、对艾滋病毒/艾滋病的高或中度风险认知（比值比=2.7；95%置信区间1.5 - 3.6）以及喜欢被动口交（比值比=0.3；95%置信区间0.2 - 0.8）。
在本次调查中，无保护肛交在男男性行为者中是一种常见行为。应进一步探究前往公共浴室的频率作为无保护肛交风险因素的情况。进一步探究这些发现对于理解这些关系以及男男性行为者中参与感染艾滋病毒的危险性行为情况很重要。
