Sex Hormone-Binding GlobulinSex-Determining Region Y ProteinSex RatioGonadal Dysgenesis, 46,XYSex Determination ProcessesSex ChromosomesDihydrotestosteroneY ChromosomeSex FactorsSex CharacteristicsBase SequenceDNAMolecular Sequence DataSexUnsafe SexSex WorkersSex DifferentiationSafe SexSex AttractantsSex Determination AnalysisSex DistributionDisorders of Sex DevelopmentSex PreselectionSex CounselingGonadal Steroid HormonesProstitutionHomosexuality, MaleSex EducationSexual BehaviorRisk FactorsAge FactorsSexual PartnersSex Chromosome AberrationsRisk-TakingSex ChromatinSex OffensesSexually Transmitted DiseasesCondomsHIV InfectionsTestosteroneCross-Sectional Studies