Sex FactorsSex CharacteristicsSex Determination ProcessesSexRisk FactorsSex AttractantsUnsafe SexSex DifferentiationSex WorkersSex ChromosomesSex-Determining Region Y ProteinHomosexuality, MaleDisorders of Sex DevelopmentProstitutionSex DistributionGenes, sryAge FactorsPrevalenceMultivariate AnalysisSexual PartnersCohort StudiesTranssexualismLogistic ModelsSOX9 Transcription FactorRetrospective StudiesCross-Sectional StudiesSafe SexProspective StudiesSexual BehaviorHIV InfectionsIncidenceSex Determination AnalysisFollow-Up StudiesTestosteroneOrchiectomyRisk-TakingPrognosisSexual Behavior, AnimalOdds RatioRisk AssessmentAge DistributionGonadal Steroid HormonesSexually Transmitted DiseasesRegression AnalysisCondomsPredictive Value of TestsQuestionnairesTime FactorsSex PreselectionTestisTransvestismY ChromosomeBisexualitySex RatioDihydrotestosteroneTesticular HormonesSmokingSeverity of Illness IndexProportional Hazards ModelsSex Hormone-Binding GlobulinUnited StatesSocioeconomic FactorsMesonephrosComorbiditySurvival AnalysisSyphilisSex CounselingTreatment OutcomeAndrogensSertoli CellsGonadsChi-Square DistributionLinear ModelsHypertensionBody Mass IndexCase-Control StudiesSurvival RateEpidemiologic MethodsInfant, NewbornAnalysis of VarianceCopulationMating Preference, AnimalBrazilEducational StatusRegistriesIndonesiaSex EducationHIV SeropositivityEthnic GroupsHigh Mobility Group ProteinsCause of DeathLongitudinal StudiesItalyAfrican AmericansSeminal VesiclesPregnancyCardiovascular DiseasesSpainAfrican Continental Ancestry GroupDisease Progression