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Area of Science:

  • Substance Use Research
  • Sexual Health
  • Public Health

Background:

  • Alcohol and marijuana use are often linked to increased sexual risk-taking behaviors.
  • Existing event-level studies present conflicting findings on substance use and condom use.
  • Limited data from few individuals or sexual events hinder comprehensive analysis.

Purpose of the Study:

  • To examine the association between alcohol and marijuana use and condom use among college women.
  • To investigate interactions between substance use, partner type, and sexual risk expectancies.
  • To provide event-level data for a more nuanced understanding of substance use and sexual risk.

Main Methods:

  • Multilevel modeling was used to analyze data from 1,856 sexual intercourse events.
  • Data were collected from 297 college women (average age 18 years; 71% White).
  • Analyses controlled for contraception use, partner type, regular substance use, impulsivity, sensation seeking, and demographics.

Main Results:

  • No significant difference in condom use during alcohol consumption events versus non-drinking events.
  • A negative dose-response relationship observed: more drinks correlated with lower condom use.
  • Stronger alcohol-sexual risk expectancies were marginally associated with lower condom use while drinking.
  • No main effect of marijuana use on condom use, but potential increased risk with romantic partners.

Conclusions:

  • Condom use is not universally affected by alcohol or marijuana, but specific factors matter.
  • The number of drinks consumed and alcohol-sexual risk expectancies are critical factors influencing condom use.
  • Marijuana use may increase unprotected sex risk with established romantic partners, warranting targeted interventions.
  • Interventions should address expectancies and the dose-response relationship between alcohol consumption and condom use.