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al monogamy4 and covert sex outside the main relationship. Delayed marriage and high divorce rates mean that growing numbers of individuals experience multiple sexual partners in a lifetime, and this greatly increases their exposure to infection. Furthermore, National Health and Social Life Survey data show that around 25% of men and 10% of women report extramarital or extracohabitational affairs.5 However, such figures vary widely across surveys, and the behavior tends to be underreported. We assume multiple partnership to be substantially more common among noncohabiting couples. It is becoming increasingly apparent that women in stable relationships are at greater risk for HIV and STDs than previously thought. One key reason for this is that condoms are used less frequently in more committed relationships.6 Given the higher rates of infidelity among men and the greater vulnerability of women Hosanna Soler is doctoral candidate and research assistant, Center for the Study of Population and Department of Sociology; David Quadagno is professor, Department of Biological Sciences; David S. Sly is professor, Center for the Study of Population and Department of Geography; Isaac W. Eberstein is professor, Center for the Study of Population and Department of Sociology; and Dianne F. Harrison is professor and dean, School of Social Work— all at Florida State University, Tallahassee, FL. Kara S. Riehman is research fellow, UCLA Drug Abuse Research Training Center, UCLA School of Medicine, Los Angeles, and is consultant to the Drug Policy Research Center, Rand, Santa Monica, CA. The research upon which this article is based was supported by grant R01-HD 31025–01–04 from the National Institute of Child Health and Human Development, National Institutes of Health. Relationship Dynamics, Ethnicity and Condom Use Among Low-Income Women