Research has consistently found that married women experienced less intimate partner violence (IPV) than cohabiting ones. However, most existing studies focus on the incidence of IPV as a binary indicator, while the severity of that exposure or the different types of violence has been largely ignored. This article begins to address these issues with a multivariate approach, for some Latin American countries. The study reports that married women suffered less violence than cohabiting women for each singular type of violence, even after controlling by education, age, locality, wealth, and personal violence history. This article proposes a novel mechanism that helps to explain these findings: marriage would provide a framework that fosters investment in the quality of the couple's relationship, thus preventing IPV. The estimates on the couple's investments support these predictions.