title: Will Gay Sex-Seeking Mobile Phone Applications Facilitate Group Sex? A Cross-Sectional Online Survey among Men Who Have Sex with Men in China.
abstract: BACKGROUND
  China is amidst a sexual revolution, with changing sexual practices and behaviors. Sex-seeking mobile phone applications (gay apps) that allow multiple people to meet up quickly may facilitate group sex. This study was therefore undertaken to evaluate group sex among Chinese MSM and to better understand factors associated with group sex.
  
  
  METHODS
  An online survey was conducted from September-October 2014, collecting data on socio-demographics, sexual behaviors, use of gay apps and occurrence of group sex among Chinese MSM. Univariate and multivariable logistic regressions were used to compare group sex and non-group sex participants.
  
  
  RESULTS
  Of the 1,424 MSM, the majority were under 30 years old (77.5%), unmarried (83.9%), and were gay apps users (57.9%). Overall, 141 (9.9%) participants engaged in group sex in the last 12 months. Multivariate analyses showed that men living with HIV, engaged in condomless anal intercourse with men, and used gay apps were more likely to engage in group sex, with adjusted ORs of 3.74 (95% CI 1.92-7.28), 2.88 (95% CI 2.00-4.16) and 1.46 (95% CI: 1.00-2.13), respectively. Among gay app users, the likelihood of group sex increases with the number of sex partners and the number of sex acts with partners met through a gay app.
  
  
  CONCLUSIONS
  Chinese MSM who engage in group sex are also more likely to engage in other risky sexual behaviors, and gay app use may facilitate group sex. Further research is needed among MSM who engage in group sex in order to target interventions and surveillance.
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Weiming
authors.initials: W
authors.lastname: Tang
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.|SESH Global, Guangzhou, China.|School of Public Health, Kunming Medical University, Kunming, China.
authors.forename: Songyuan
authors.initials: S
authors.lastname: Tang
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Yilu
authors.initials: Y
authors.lastname: Qin
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Chuncheng
authors.initials: C
authors.lastname: Liu
authors.affiliation: Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.
authors.forename: Lai Sze
authors.initials: LS
authors.lastname: Tso
authors.affiliation: Department of Epidemiology and Biostatistics & Global Health Sciences, University of California, San Francisco, California, United States of America.
authors.forename: Chongyi
authors.initials: C
authors.lastname: Wei
authors.affiliation: Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.
authors.forename: Ligang
authors.initials: L
authors.lastname: Yang
authors.affiliation: Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.
authors.forename: Shujie
authors.initials: S
authors.lastname: Huang
authors.affiliation: Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yang
authors.affiliation: University of North Carolina Project-China, Guangzhou, China.|Guangdong Provincial Center for Skin Diseases and STI Control, Guangzhou, China.|SESH Global, Guangzhou, China.
authors.forename: Joseph
authors.initials: J
authors.lastname: Tucker
mesh_terms: D000328:Adult; D044466:Asian People; D002681:China; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D063731:Mobile Applications; D012309:Risk-Taking; D012725:Sexual Behavior