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Why does early sexual intercourse predict subsequent maladjustment? Exploring potential familial confounds.

Kelly L Donahue1, Paul Lichtenstein, Niklas Långström

  • 1Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405, USA. kldonahu@indiana.edu

Health Psychology : Official Journal of the Division of Health Psychology, American Psychological Association
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Early sexual intercourse may not directly cause psychosocial problems. Shared family factors, not a causal link, likely explain the association between early sex and later difficulties.

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Area of Science:

  • Psychology
  • Sociology
  • Behavioral Science

Background:

  • Previous research indicates a link between early sexual debut and later psychosocial maladjustment.
  • Familial confounds have not been extensively explored as potential explanations for this association.

Purpose of the Study:

  • To investigate the role of shared familial factors in the association between early age at first sexual intercourse and psychosocial health.
  • To differentiate between direct causal effects and shared environmental/genetic influences.

Main Methods:

  • Utilized a population-based cohort of Swedish adult twins (N=12,126, ages 19-47).
  • Employed discordant-twin analyses and bivariate twin modeling to assess genetic and environmental confounds.
  • Examined outcomes including substance use, depression, criminal convictions, and adolescent childbearing.

Main Results:

  • Individuals with early intercourse (before age 16) showed higher risks for adverse psychosocial outcomes.
  • However, twin pairs discordant for early intercourse did not significantly differ in psychosocial maladjustment risk.
  • Findings suggest shared familial factors explain the observed association.

Conclusions:

  • The association between early intercourse and poor psychosocial health is likely mediated by shared familial influences.
  • A direct causal link is less supported.
  • Interventions should consider addressing common risk factors within families.