Unique study examines differences across partner types
A new study from researchers at The Miriam Hospital finds a link between alcohol consumption and reduced condom use among college women. The findings also
indicate that women who smoke marijuana with established romantic partners may use condoms less often. The study was recently
in the Journal of Sex Research.
Young people between the ages of 15 and 24 account for 50 percent of all new HIV infections and are also at an elevated risk for other sexually transmitted
infections (STIs). Condom use is an excellent method for reducing the risk of STIs as well as unplanned pregnancy, so it is important to understand the
factors predicting use.
Jennifer Walsh, PhD, of the Centers for Behavioral and Preventive Medicine at The Miriam Hospital is the lead author of a study funded by a grant from the National Institutes of on Alcohol Abuse and Alcoholism. Walsh and fellow researchers set out to
determine whether college women were less likely to use condoms if they consumed alcohol or smoked marijuana before engaging in sexual intercourse. To do
so, they looked at data from 1,856 sexual events reported by 297 first-year college women.
Two study hypotheses were confirmed. First, the researchers found a negative association between the number of drinks and condom use -- women who consumed
more alcohol before sex were less likely to use condoms than women who had fewer drinks. Second, they found that when a woman has been dating a romantic
partner for three months or more, marijuana use may increase the risk of unprotected sex.
Walsh explains why this study was unique. “Our study provides new information about condom use and substance use with specific subtypes of sexual
partners,” she says. Past studies have often characterized sexual partners as only romantic/steady or casual.
Walsh says for this study, the researchers collected data on a wider range of sexual partners. She notes, “We found that both substance use and condom use
varied based on specific partner type. Not only were alcohol use and condom use both less likely with romantic than with casual partners, but specific
subtypes of romantic partners (new versus established) and casual partners (ex-boyfriends, friends, acquaintances, and strangers) differed from one
The method for this study involved a large sample, multiple sexual events per person and detailed assessments. Walsh believes this methodology helped her
and her colleagues to improve upon most previous research, allowing stronger inferences regarding the alcohol-condom use and marijuana-condom use
Walsh concludes, “The results of our study suggest possible areas for intervention with young women. Efforts to reduce alcohol-involved sexual risk
behavior might emphasize the dose-response relationship of drinks to condom use once one decides to drink or aim to reduce alcohol-sexual risk
expectancies. Differences between types of sexual partners suggest the value of detailed assessments of partner types, and future research should consider
categorizing sexual partners in a similar manner.”
Walsh’s principal affiliation is The Miriam Hospital, a member hospital of the Lifespan health system in Rhode Island. The research was supported by a
grant from the National Institutes of on Alcohol Abuse and Alcoholism. The researcher also has an academic appointment at The Warren Alpert Medical
School of Brown University as an Assistant Professor of Psychiatry and Human Behavior. Her lab and research is fully supported by The Miriam Hospital
and the Lifespan health system. Other researchers involved in the study with Walsh are Michael Carey, PhD, of the Miriam Hospital and Brown
University (Principal Investigator); Kate Carey, PhD, of Brown University; and Robyn L. Fielder, PhD, of Syracuse University.