简介：Objectives:TodescribeandanalyzeHIV/AIDS/STD-relatedhighriskbehaviorsandaffectingfactorsofmenwhohavesexwithmen(MSM)inmainlandChina~Methods:426self-administeredorinterview-basedquestionnairescollectedfromMSMwereanalyzedwithSPSSorSASSystems.Results:OftheMSM,four-fifthshadengagedinoral-genitalintercourse,abouthalfhadengagedinanalintercourse,andinthepastyearmorethantwo-fifthshadcasualsexualpartner(s).Veryfewmaintainedmonogamoussexualrelationships,andnearlyhalfalsohadintercoursewithwomen.Onefourthhadpreviouslybeendiagnosedwithavenerealdiseases.OneHIV+individualwasfoundamongthe40whoreportedhavingbeentestedforHIV.Onlytwomenconsistentlyusedcondomsamongtheone-thirdwhohadeverusedcondoms,despitealmostuniversalknowledgeofHIVanditstransmission.Conclusions:MSMinmainlandChinaareverysexuallyactive,highlightingthepossibilityofaseriousHIVepidemicthatmaybedirectlyspreadtothefemalepopulation.However,AIDSinterventionstargetingMSMfacesevereobstructionsresultingfromculturalbiasandotherfactors.