To investigate the association between physical intimate partner violence (IPV) and sexually transmitted infection (STI) in two national samples. Data came from the National Epidemiologic Survey on Alcohol and Related Conditions Wave 2 (n = 34,653) and the National Family Health Survey-3 (n = 124 385). Ever-married women between the ages of 20 and 49 were asked if they had experienced physical violence by their partner in the past year. Outcomes were presence of doctor confirmed HIV and self-reported STI. Age at first intercourse was examined as a mediator of the relationship between IPV and STI. Logistic regression examined associations between IPV, age at first intercourse and STI. Compared to individuals with no physical IPV, risk for STI was higher for individuals who experienced past year IPV living in the United States and India, however once controlling for age at first intercourse, age, education, household wealth/income and past year sexual violence, the relationship between IPV, and STI was significant in the American sample [(AOR) = 1.65, 95% (CI) = 1.21-2.26], however not for individuals living in India [(AOR) = 1.75, 95% (CI) = 0.84-3.65]. Individuals with exposure to physical IPV are at increased odds for STI. Age at first intercourse although a marker of risk, may not be an accurate marker of risky sexual behavior in both samples.