I have always wanted a female t, I never felt comfortable in the presence of men (thanks dad and the asshat men in my life). I've found that even among female t's, I have gotten ones I click with and ones I don't. My t before this one was a male, and it worked ok to get past some of my issues of fear with men in power, but I did not successfully address the things I really needed to in the past year. I find it harder to be more open with a male t. I would now be less adverse to working with a male t, but would not go searching for one.
Lesbian female t's are a bit tough if we happen to run in similar circles, but it's also helpful with some issues (the question of sexuality because of male issues never comes up). So far my t's have always been respectful if we bump into each other in public (or our social circles) - one of us leaves the group for the night.