Sexual aversion is a widespread, poorly recognized syndrome occurring in both males and females. Once diagnosed, it is relatively resistant to conventional forms of therapy. Aversion is characterized by an unwillingness to get involved in sexual activity, with avoidance of any touching or communication that might lead to sexual involvement. This syndrome usually presents as a lack of libido, low sex drive, inhibited sexual desire or arousal dysfunction. Aversion may be seen along with other sexual dysfunctions, as a precipitating cause or as a consequence. However, aversion can also be the only dysfunction present. Once aversion is correctly diagnosed, identifying the type of aversion present is a prerequisite to appropriate therapy. Primary and secondary aversion are treated differently and have a different prognosis. This article describes the Sexual Aversion Syndrome, and distinguishes between primary and secondary aversion for the purpose of treatment and prognosis.