The current study provides initial validity evidence for a measure of Transactional Sex (TS). Participants (N = 269) were recruited from a Northeastern University in the United States and consisted of undergraduate and graduate students. Participants completed an online survey through QuestionPro that contained the Transactional Sex Measure (TSM) as well as measures of depression, anxiety, and stress, condom use negotiation self-efficacy and sexual risk, alcohol and drug use, and materialism. Construct and criterion validity were examined. Findings revealed that the TSM provided good criterion validity evidence but the construct validity evidence was minimal. Further studies on the conceptualization of TS and distribution of the TSM across a variety of diverse samples can provide more validity evidence.