PrevalenceSex CharacteristicsSex FactorsSex DistributionSexRisk FactorsCross-Sectional StudiesSex DifferentiationAge FactorsGonadal Steroid HormonesSex ChromosomesAge DistributionGonadal HormonesSex Determination ProcessesQuestionnairesUnited StatesTestosteroneCastrationUnsafe SexCohort StudiesAnalysis of VarianceHealth SurveysOvariectomyLogistic ModelsSex WorkersBrazilSocioeconomic FactorsAgingIncidenceOrchiectomySmokingTime FactorsEstradiolChinaProspective StudiesRural PopulationRetrospective StudiesHIV InfectionsPubertyPregnancySafe SexUrban PopulationOdds RatioBrainBody Mass IndexComorbidityObesityInfant, NewbornIndiaStress, PsychologicalSexual BehaviorRegression AnalysisSexual Behavior, AnimalGender IdentityEuropean Continental Ancestry GroupPopulation SurveillanceBody WeightMultivariate AnalysisEstrogensHypertensionLongitudinal StudiesSeverity of Illness IndexSex AttractantsBehavior, AnimalCase-Control StudiesGenotypeEpidemiologic MethodsJapanSex Determination AnalysisChi-Square DistributionDiabetes MellitusRats, Sprague-DawleyDisorders of Sex DevelopmentAfrican Continental Ancestry GroupPreoptic AreaSpainSocial BehaviorFollow-Up StudiesGonadsEstrous CycleAndrogensMidline Thalamic NucleiRisk AssessmentReference ValuesPainAnthropometryMagnetic Resonance ImagingEthnic GroupsHomosexuality, MaleBlood PressureChronic DiseaseProstitutionAlcohol DrinkingSeasonsRisk-TakingMotor ActivityFecesRural HealthMass ScreeningLinear Models