Fem-dom thoughts?

A fellow writer read one of my stories, which I'm having trouble getting published, recently. She commented that a reason why I'm having problems selling it might be of the fem-dom theme. Of course, I just stood there blinking. What fem-dom thingy? Sure the hero calls the heroine mistress. But what did you expect? She is a vampire, and he is her slave. But she doesn't treat him like that. There's only one - mind you, ONE - sex scene in which she is acting all dom, and he's all submissive, allowing her to tie him up to the bed and have her way with his body. And I can't eliminate that scene because it's a flashback which shows how the hero and the heroine's relationship used to be, versus how their relationship is now that he is reborn. (He is more aggressive, and likes to take charge in during the sex act.) So I don't see it as a fem-dom story. Still, she is sure that there's a possibility that it might have been perceived that way. She went on to explain me that fem-dom stories aren't popular among erotic romance readers. My question is, would you read a fem-dom story? If so, why do you like them? If not, why do you shy away from reading stories in which the woman likes to dominate, and the man goes along with it during sex?