title: Sexual behaviour and early coitarche in a national sample of 17-year-old Swedish boys.
abstract: OBJECTIVE
  To describe sexual behaviour as reported by 17-year-old boys in Sweden.
  
  
  METHODS
  The national cross-sectional SAM 73-90 questionnaire survey was performed in 1990, and comprised 2% of students and school non-attenders born in 1973. The respondents included 814 students and 92 non-students, response rates 90.6% and 40.2%, respectively. Data from the two groups are treated separately.
  
  
  RESULTS
  In the student group, 54.2% of boys had experienced vaginal intercourse and 16.7% were "early starters" with coitarche before 15 y of age. Independent predictors for coital experience were the vocational study programme OR (odds ratio) 1.91 (95% CI 1.31-2.78), early puberty OR 1.69 (95% CI 1.11-2.57), use of tobacco OR 5.32 (95% CI 2.43-11.7) and alcohol OR 4.09 (2.79-5.98). Sexually transmitted infections (STIs) were reported by 4.1% of coitally active student boys, and impregnating a girlfriend by 4.3%. Of the early starters, 14.6% reported having more than 10 sex partners as compared with 2.5% of the later starters (p < 0.0001) and this was predictive of STI, OR 5.4 (95% CI 1.5-19.7). First-date intercourse more than twice was predictive of pregnancy, OR 14.4 (95% CI 3.8-54.5). Among school non-attenders, 74.2% reported coital experience, 33.7% were early starters, and 12.5% had impregnated a girl.
  
  
  CONCLUSIONS
  Boys' early sexual experience was related to early puberty, and to general adolescent risk-taking behaviour. Early coitarche per se was not predictive of STI or pregnancy, but the associated high number of "lifetime" sexual partners and first-date intercourse were predictive factors. School non-attenders constituted a group at risk.
authors.affiliation: Department of Venhälsan, Gay Men's Health Clinic, Karolinska Institute at Söder Hospital, Stockholm, Sweden. karin.edgardh@ulleval.no
authors.forename: K
authors.initials: K
authors.lastname: Edgardh
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D003075:Coitus; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D006266:Health Education; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D016015:Logistic Models; D008297:Male; D016017:Odds Ratio; D011336:Probability; D012307:Risk Factors; D012309:Risk-Taking; D012494:Sampling Studies; D012736:Sex Education; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D012747:Sexual Partners; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D013997:Time Factors