To me the issue of equality is somewhat irrelevant to the original poll question. The question was, "Does it bother you if an agency owner sleeps with his SPs?"
Of course, in any employer/employee situation, equality does not exist. It also goes without saying, as Ronnie has noted, that it is at a minimum imprudent for an agency owner to have sex with his SPs, for the reasons she has stated. It seems to me, however, that these issues go to the question, "should it bother an agency owner to sleep with his SPs?" That is a different question than the poll question.
The question is whether a hobbyist should care if the SP he is seeing had sex with another customer as opposed to the agency owner the prior night. And the overwhelming poll response has been that the hobbyist is totally indifferent.
Now if the poll question was, "is it ethical or appropriate for an agency owner to sleep with his SPs?", some of the questions resonating through this thread become more relevant. I am really surprised, however, that the analysis of this wholly different question has focused on the abuse of power and authority inherent in the employer/employee relationship. Nobody has really discussed the more difficult issue of sex not being motivated by power or authority, but rather by feelings of love and lust.
I have tried to put myself in the shoes of these agency owners and it would be very difficult to avoid and refuse these temptations. I consider myself fortunate that the women in my office are all older, homely, married women. These agency owners are all night surrounded by attractive young women dressed very sexily. It cannot be an easy thing to have a constant erection and not be able to do anything about it. I actually feel sorry for these guys because it is a horrible Catch 22 situation which they are in. It's not like being a clothing salesman. Clothing and other inanimate objects do not cause erections. There is no other business where a male employer is constantly surrounded by attractive young women who are paid to look sexy, except maybe the manager of a Hooters restaurant.
The bottom line is that this thread has gone in a different direction than the original poll question, which in the poll got the response that was warranted by the question.