This paper describes money laundering techniques used by different criminal organizations operating in the U.S. sex market. Prior to this study, scholars have not investigated money laundering techniques used in the U.S. sex market in a comprehensive manner. This paper describes and categorizes methods used for money laundering. It discusses the similarities and differences in money laundering techniques in the U.S. sex markets. Current challenges to combating money laundering are reviewed and recommendations are made to strengthen the ongoing fight against money laundering in the U.S. sex markets.