You do not have to be afraid of people who engage in SM. SM players are doctors, lawyers, teachers, construction workers, fire fighters, secretaries and everything else you can imagine.
In her 1983 book Erotic Power, sociologist Gini Scott examined the dynamics of the heterosexual SM subculture.
She stated: "Unlike the psychiatrists and psychologists who deal primarily with psychologically troubled individuals who are also interested in D&S [Dominance and Submission], I did not find them to be psychologically troubled or socially inept; rather, a spirit of good humor and fun prevailed, and the participants appeared to be mostly attractive, quite ordinary-looking people who had ordinary relationships outside the D&S scene... A vast variety of people with a diverse range of erotic interests participate in sadomasochiSM. Their backgrounds, activities and attitudes are quite unlike the social stereotype that depicts sadomasochiSM as a form of violence, mischief, or mayhem perpetrated by the psychologically unstable who seek to hurt others or to be hurt themselves... At the core of the community are mostly sensible, rational respectable, otherwise quite ordinary people. Thus, quite unlike its public image, the community is a warm, close and supportive one."
Gini Scott (1983). Erotic Power, Citadel Press: pg. x.