With intimate partner violence (IPV) among same-sex couples largely ignored by policy makers and researchers alike, accurately estimating the size of the problem is important in determining whether this minimal response is justified. As such, the present study is a secondary data analysis of the National Violence Against Women Survey and represents the first multiple variable regression analysis of U.S. adult same-sex IPV prevalence using a nationally representative sample (N = 14,182). Logistic regressions indicate that, independent of sex, respondents with a history of same-sex relationships are more likely to experience verbal, controlling, physical, and sexual IPV. Behaviorally "bisexual" respondents experience the highest IPV rates and are most likely to be victimized by an opposite-sex partner. Implications for future IPV research regarding sexual orientation and gender are discussed. (Contains 3 tables.)