Melbourne Sexual Health Centre, Alfred Health, Melbourne, Vic, Australia; and School of Translational Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Vic, Australia.
Melbourne Sexual Health Centre, Alfred Health, Melbourne, Vic, Australia; and School of Translational Medicine, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Vic, Australia; and Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Vic, Australia.
Sex Health. 2024 Aug;21. doi: 10.1071/SH23190.
Background The patterns of sexually transmitted infections (STIs) in populations may be influenced by the sexual mixing within the population. We aimed to investigate the assortative sexual mixing pattern by bisexuality in male-male partnerships. Methods This was a retrospective repeated cross-sectional study of men with mostly regular male partners attending the Melbourne Sexual Health Centre between 2011 and 2019. Data on sexual practices, including their sexual practices, presence of other male/female sex partners and the gender of sexual partners in the previous 3 and 12months, were collected using computer-assisted self-interview. We calculated the proportion of male partnerships where at least one man in the partnership reported a female sex partner. Results A total of 2056 male-male partnerships (i.e. 4112 individuals) with a median age of 29 years (IQR 25 to 35) were included. Overall, in 94.4% (1941/2056) of male-male partnerships both men had male partners only; however, in 5.5% (113/2056) of partnerships, one man had both male and female partners, and in 0.1% (2/2056) partnerships, both men had both male and female partners. No assortative relationship was found on the sexual mixing by bisexuality in male-male partnerships due to the low assortativity coefficient (r =0.006, 95% CI: -0.004 to 0.016). Conclusion One in 20 male-male partnerships had at least one man who had both male and female partners within the preceding year. Individuals were not selective by bisexuality, suggesting that partnerships of bisexual individuals are mixed proportionately to the distribution of their characteristics. Still, these sexual mixing practices may affect STI transmission dynamics.
人群中的性传播感染（STI）模式可能受到人群内的性混合影响。我们旨在通过男男性行为者的双性恋来研究性混合的分类关系模式。
这是一项回顾性的重复横断面研究，研究对象为 2011 年至 2019 年间在墨尔本性健康中心就诊的大多数有固定男男性伴的男性。使用计算机辅助自我访谈收集性实践的数据，包括他们的性实践、其他男性/女性性伴的存在以及前 3 个月和 12 个月的性伴的性别。
共纳入 2056 对男男性伴关系（即 4112 人），中位年龄为 29 岁（IQR 25 至 35）。总体而言，在 94.4%（1941/2056）的男男性伴关系中，两人均仅有男性伴侣；然而，在 5.5%（113/2056）的关系中，一名男性既有男性伴侣也有女性伴侣，在 0.1%（2/2056）的关系中，两人均既有男性伴侣也有女性伴侣。由于双性恋的分类关系系数较低（r=0.006，95%CI：-0.004 至 0.016），因此未发现男男性伴关系中的双性恋性混合存在分类关系。
每 20 对男男性伴关系中就有 1 对至少有 1 名男性在过去 1 年内既有男性伴侣也有女性伴侣。个体并非通过双性恋选择，这表明双性恋者的伴侣关系是按照其特征的分布比例混合的。尽管如此，这些性混合实践可能会影响性传播感染的传播动态。
