Let me preface this by saying I am in no way racist, and the opinions shared are those I have observed over a career of pooning, I have spoken candidly with many SP's over the years about many different subjects. With respect to African American clients, the predominant reason sited was that, in their experiences, younger black men tended to be more aggressive as compared to say Asian or Caucasian customers. I've known some SP's who have this restriction and will only see black men over 40, if at all. I`m sure each SP has their own reasons, but the majority I've spoken to described a sense of entitlement once there with a desire to assert, sometimes aggressively, their sexual will.