Needing a therapist, which would you all recommend

I have had ongoing sex issues with my fiancee. Sex issues meaning, she doesn't want to have sex with me ever. It's getting to the point that I feel she is repulsed by me and nothing I do seems to work. I am wanting to speak with a professional so I can figure out if I'm truly the problem or if maybe there is something else going on.

With this, would you look into a general behavioral counselor, or would you look for someone geared toward marital issues?