Hello UnderPromise,
When I went into my first session I was very well aware of my fetish and desire to submit. I have been involved in discussions with others who were not so conscious of what they wanted/desired other than that they wanted to explore. From that exploration, some have evolved from submissive to dominant and dominant to submissive, some are just fetishists or kinky and others have moved on. If something is compelling you to "check it out" and you have the means to do that, why not check it out?
My experience has been that when I have made choices solely based on appearance, I have made bad choices. Not always, though most of the time. When I have done research and have identified someone who shares interests with me and that I am also physically attracted to, I have never had a bad session. I may not get a great session, though typically when I do the research I get sessions that range from very good to great.