Adolescent BehaviorFamily TherapyParent-Child RelationsSexual BehaviorSubstance-Related DisordersSexual Behavior, AnimalBehavior, AnimalRisk-TakingFeeding BehaviorAdolescent PsychologySocial BehaviorSexual PartnersHealth BehaviorCopulationCondomsUnsafe SexSexually Transmitted DiseasesBehaviorSexual AbstinenceCoitusQuestionnairesAdolescent DevelopmentChild BehaviorHIV InfectionsExploratory BehaviorPeer GroupHealth Knowledge, Attitudes, PracticeHomosexuality, MaleCross-Sectional StudiesAdolescent Health ServicesSafe SexAggressionChild Behavior DisordersMaternal BehaviorAgonistic BehaviorStudentsBehavior TherapyRisk FactorsInterpersonal RelationsSex FactorsLongitudinal StudiesPrevalenceSex EducationMotor ActivityAge FactorsSocial EnvironmentStereotyped BehaviorParentingUnited StatesSexualityAlcohol DrinkingContraception BehaviorRisk Reduction BehaviorAdolescent MedicineSocioeconomic FactorsHeterosexualityEjaculationBisexualityContraceptive Devices, MaleCourtshipPregnancy in AdolescencePreoptic AreaUrban PopulationHomosexualityChoice BehaviorSelf-Injurious BehaviorReligion and SexAfrican AmericansCompulsive BehaviorConsummatory BehaviorMotivationInterviews as TopicAnalysis of VarianceProstitutionParentsHealth SurveysSchoolsImpulsive BehaviorLogistic ModelsSocial Behavior DisordersAdolescent PsychiatrySex CharacteristicsExtramarital RelationsAppetitive BehaviorAdolescent Nutritional Physiological PhenomenaAttitude to HealthTime FactorsNesting BehaviorAnxietyAphrodisiacsViolenceBehavior, AddictiveSelf ConceptModels, PsychologicalDrinking BehaviorHealth PromotionSelf DisclosureHealth EducationHIV SeropositivityRural Population