Ortmann, David M., and Richard A. Sprott. 2013. Sexual Outsiders: Understanding BDSM Sexualities and Communities
Sexual Outsiders is primarily a guide for people in the helping professions (psychiatrists, psychologists, therapists and counsellors).
If you need to ask why this book is necessary, there is a problem of “therapy refugees”, people who have been unable to get therapy because they have been, or fear being, rejected for being kinky:
“After an off-hand comment made by the therapist about ‘those sick people who beat each other,’ I was put into a position of being unable to talk about any connections I had to BDSM. I also felt that it was unsafe to discuss that I was raped by a partner (which was something I needed to talk about) because we had been involved in a Dom/sub relationship.” [Pg.122-123]
