title: Smart teens don't have sex (or kiss much either).
abstract: OBJECTIVE
  To examine the relationship between an intelligence measure and a wide spectrum of partnered sexual activity ranging from holding hands to sexual intercourse among adolescents.
  
  
  METHODS
  Analyses are based on two separate samples of adolescents. The core sample of the National Longitudinal Study of Adolescent Health (Add Health) includes approximately 12,000 adolescents enrolled in the 7th to 12th grades. The Biosocial Factors in Adolescent Development projects followed approximately 100 white males and 200 black and white females over 3- and 2-year periods, respectively. Both studies used the Peabody Picture Vocabulary Test (PPVT) as an intelligence measure, and confidential self-reports of sexual activity. Logistic regression models were used to examine the relationship between PPVT scores and coital status in Add Health data; proportional hazard models were used to examine the timing of initiation of noncoital and coital activities as a function of PPVT scores in the Biosocial Factors sample.
  
  
  RESULTS
  Controlling for age, physical maturity, and mother's education, a significant curvilinear relationship between intelligence and coital status was demonstrated; adolescents at the upper and lower ends of the intelligence distribution were less likely to have sex. Higher intelligence was also associated with postponement of the initiation of the full range of partnered sexual activities. An expanded model incorporating a variety of control and mediator variables was tested to identify mechanisms by which the relationship operates.
  
  
  CONCLUSIONS
  Higher intelligence operates as a protective factor against early sexual activity during adolescence, and lower intelligence, to a point, is a risk factor. More systematic investigation of the implications of individual differences in cognitive abilities for sexual activities and of the processes that underlie those activities is warranted.
authors.affiliation: University of North Carolina at Chapel Hill, USA.
authors.forename: C T
authors.initials: CT
authors.lastname: Halpern
authors.forename: K
authors.initials: K
authors.lastname: Joyner
authors.forename: J R
authors.initials: JR
authors.lastname: Udry
authors.forename: C
authors.initials: C
authors.lastname: Suchindran
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000208:ethnology / Q000523:psychology*; D001741:Black or African American / Q000523:psychology / Q000706:statistics & numerical data; D004522:Educational Status; D005260:Female; D006306:Health Surveys; D006801:Humans; D007360:Intelligence; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D009035:Mothers / Q000193:education; D016016:Proportional Hazards Models; D011627:Puberty / Q000208:ethnology / Q000502:physiology / Q000523:psychology; D012307:Risk Factors; D012725:Sexual Behavior / Q000208:ethnology / Q000523:psychology* / Q000706:statistics & numerical data; D014481:United States; D044465:White People / Q000523:psychology / Q000706:statistics & numerical data