Charles Allen Moser (born 1952) is an American physician specializing in transgender health, a clinical sexologist, sex therapist, and sex educator practicing in San Francisco, California.
He is the author of numerous academic publications and books in the fields of transgender health, paraphilias including BDSM, and sexual medicine.
in 1991, Moser was a Licensed Clinical Social Worker in California with a private psychotherapy practice specializing in the treatment of sexual issues.
[2] He has authored papers alone and with Peggy Kleinplatz in the area of sex therapy, and the classification of paraphilias.
[3] Moser and Kleinplatz argue that paraphilias should be removed from the Diagnostic and Statistical Manual of Mental Disorders (DSM).