rare paraphilia that revolves around an individual's sexual satisfaction being derived from rubbing upon another non-consenting individual. The term frotteurism itself can be broken down and derived from the French verb frotter which means rubbing. Diagnosis In the DSM-5 all paraphilia disorders can be diagnosed by two main criteria that are referred to criteria A and criteria B respectively. The A and B criteria include a duration in which the behavior must be present for (typically six months) and specific details of actions or thoughts that are correlated specifically with the respective disorder being diagnosed. Treatment Psychosexual disorders can vary greatly in severity and treatability. Medical professionals and licensed therapists are necessary in diagnosis and treatment plans. Treatment can vary from therapy to prescription medication. Sex therapy, behavioral therapy, and group therapy may be helpful to those distressed by sexual dysfunction. More serious sexual perversions may be treated with androgen blockers or selective serotonin reuptake inhibitors (SSRIs) to help restore hormonal and neurochemical balances. History Sigmund Freud Sigmund Freud has contributed to the idea of psychosexual disorders and furthered research of the topic through his ideas of psychosexual development and his psychoanalytic sex drive theory. According to Freud's ideas of psychosexual development, as a child, one will progress through five stages of development. These stages being the oral stage (1 -1 1/2 yrs), the anal stage(1 1/2- 3yrs) phallic stage (3-5 yrs), the latency stage (5-12 yrs) and the genital stage (from puberty on). A psychosexual disorder could arise in an individual if the individual does not progress through these stages properly. Proper progression through these stages requires the correct amounts of stimulation and gratification at each stage. If there is too little stimulation at a certain stage fixation occurs and becoming overly fixated could lead to a psychosexual disorder. In contrast, too much stimulation at a certain stage of development could lead to regression when that individual is in distress, also possibly leading to a psychosexual disorder. Richard Freiherr von Kraft-Ebing Richard Krafft-Ebing was a German psychiatrist who sought to revolutionize sexuality in the late nineteenth century. Working in a time of sexual modesty, Krafft-Ebing brought light to sexuality as an innate human nature verses deviancy. His most notable work, Psychopathia Sexualis, was a collection of case studies highlighting sexual practices of the general public. The textbook was the first of its kind recognizing the variation within human sexuality,