Background Sexual behavioural studies among men who have sex with men (MSM) are predominantly focused on penile-anal intercourse. Other non-anal sexual activities are under-studied. This study aimed to examine the age pattern of a range of sexual activities among MSM with the most recent male sex partner. Methods We conducted a survey among MSM attending the Melbourne Sexual Health Centre in 2017. This survey asked about nine different sexual activities with their most recent regular and casual partner. A Chi-square trend test was used to examine the age patterns of each sexual activity. Results A total of 1596 men answered the survey and their median age was 30 (IQR 25–37) years. With casual partners, kissing was the most common activity (92.4%), followed by performing penile-oral sex (86.0%) and receiving penile-oral sex (83.9%). The least common activity was insertive rimming (38.1%). Young men were more likely to engage in kissing (ptrend<0.001), receptive rimming (ptrend=0.004) and receptive penile-anal sex (ptrend<0.001) but they were less likely to have insertive penile-anal sex compared with older MSM. With regular partners, the most common activity was kissing (97.4%), followed by touching penises (90.0%) and performing penile-oral sex (88.3%). Age was not associated with most types of sexual activity with regular partners except mutual masturbation and receptive penile-anal sex. Younger men were more likely to masturbate mutually (ptrend=0.028) and engage in receptive penile-anal sex (ptrend=0.011). Conclusions The pattern of sexual activities shows age-related differences with casual partners but less so with regular partners in MSM. All data relevant to the study are included in the article or uploaded as supplementary information.

中文翻译：

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澳大利亚墨尔本男男性行为者中与最近伴侣发生性行为的年龄模式：一项横断面研究

背景 男男性行为者 (MSM) 的性行为研究主要集中在阴茎-肛门性交上。其他非肛门性行为研究不足。本研究旨在检查 MSM 与最近的男性性伴侣进行一系列性活动的年龄模式。方法 我们在 2017 年对参加墨尔本性健康中心的 MSM 进行了一项调查。这项调查询问了他们最近的固定和临时伴侣的九种不同的性活动。卡方趋势检验用于检查每次性活动的年龄模式。结果 共有 1596 名男性回答了调查，他们的中位年龄为 30 (IQR 25-37) 岁。对于临时伴侣，接吻是最常见的活动（92.4%），其次是阴茎口交（86.0%）和阴茎口交（83.9%）。最不常见的活动是插入式镶边 (38.1%)。年轻男性更有可能进行接吻 (ptrend<0.001)、接受性轮奸 (ptrend=0.004) 和接受性阴茎肛交 (ptrend<0.001)，但与老年 MSM 相比，他们不太可能进行插入性阴茎肛交。对于固定伴侣，最常见的活动是接吻（97.4%），其次是触摸阴茎（90.0%）和进行阴茎口交（88.3%）。除了相互手淫和接受性阴茎肛交之外，年龄与大多数类型的固定伴侣的性活动无关。年轻男性更有可能相互手淫（ptrend=0.028）并进行接受性阴茎肛交（ptrend=0.011）。结论 在 MSM 中，性活动模式与临时伴侣的年龄相关差异，但与固定伴侣的差异较小。