Constantinou Heidi, Fairley Christopher K, Bradshaw Catriona S, Choi Edmond P H, Maddaford Kate, Phillips Tiffany R, Chow Eric P F
Melbourne Sexual Health Centre, Alfred Health, Melbourne, Vic. 3053, Australia; and Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Vic. 3004, Australia.
Melbourne Sexual Health Centre, Alfred Health, Melbourne, Vic. 3053, Australia; and Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Vic. 3004, Australia; and Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Vic. 3053, Australia.
Sex Health. 2022 Mar;19(1):39-45. doi: 10.1071/SH21224.
There have been limited studies of group sex among heterosexual individuals. This study aimed to explore the factors associated with group sex among heterosexual males and females to improve risk assessment guidelines and inform sexually transmitted infection (STI) screening requirements.
A cross-sectional survey was conducted among heterosexual males and females aged ≥16 years attending the Melbourne Sexual Health Centre between March and April 2019. The survey asked about group sex participation, methods used to meet sexual partners, number of casual and/or regular partners, and injection drug use (IDU) in the previous 3 months. HIV and STI (chlamydia, gonorrhoea, syphilis) diagnoses were extracted. A multivariable logistic regression was conducted to identify the factors associated with group sex participation.
A total of 698 participants (325 males, 373 females) were included and 4.7% (33/698) had participated in group sex in the previous 3 months. The proportion who participated in group sex increased with age (2.1% in 16-24 years, 5.5% in 25-34 years, 7.8% in ≥35 years, p trend =0.010). Meeting partners at sex venues (e.g. brothels) was associated with the highest odds of participating in group sex (aOR=5.74, 95% CI: 1.20-27.44), followed by dating apps (aOR=2.99, 95% CI: 1.36-6.58), friends/family (aOR=2.99, 95% CI: 1.34-6.69) and social venues (e.g. bar) (aOR=2.73, 95% CI: 1.18-6.30). Group sex was strongly associated with STI positivity (aOR=6.24, 95% CI: 2.41-16.13). There was no association between group sex and sex, casual and/or regular partners, HIV positivity or IDU.
Heterosexual individuals participating in group sex had a six-fold risk of testing positive for STIs. Including group sex in a sexual history is useful to determine STI risk and inform testing practices. Safe sex messages on group sex that are delivered through multiple methods (e.g. at sex venues, social venues and dating apps simultaneously) would be beneficial.
关于异性恋者群体性行为的研究有限。本研究旨在探讨与异性恋男性和女性群体性行为相关的因素，以改进风险评估指南并为性传播感染（STI）筛查要求提供信息。
于2019年3月至4月间，对年龄≥16岁、前往墨尔本性健康中心就诊的异性恋男性和女性进行了一项横断面调查。该调查询问了群体性行为参与情况、结识性伴侣的方式、过去3个月内的临时性和/或固定性伴侣数量以及注射吸毒情况。提取了艾滋病毒和性传播感染（衣原体、淋病、梅毒）的诊断信息。进行多变量逻辑回归分析以确定与群体性行为参与相关的因素。
共纳入698名参与者（325名男性，373名女性），其中4.7%（33/698）在过去3个月内参与过群体性行为。参与群体性行为的比例随年龄增长而增加（16 - 24岁为2.1%，25 - 34岁为5.5%，≥35岁为7.8%，p趋势 = 0.010）。在性场所（如妓院）结识性伴侣与参与群体性行为的几率最高相关（调整后比值比[aOR]=5.74，95%置信区间[CI]：1.20 - 27.44），其次是约会应用程序（aOR = 2.99，95% CI：1.36 - 6.58）、朋友/家人（aOR = 2.99，95% CI：1.34 - 6.69）和社交场所（如酒吧）（aOR = 2.73，95% CI：1.18 - 6.30）。群体性行为与性传播感染阳性密切相关（aOR = 6.24，95% CI：2.41 - 16.13）。群体性行为与性别、临时性和/或固定性伴侣、艾滋病毒阳性或注射吸毒之间无关联。
参与群体性行为的异性恋者性传播感染检测呈阳性的风险高出六倍。在性史中纳入群体性行为情况有助于确定性传播感染风险并指导检测实践。通过多种方式（如同时在性场所、社交场所和约会应用程序上）传递关于群体性行为的安全性行为信息将是有益的。
