I'll consider my questioning what's at the heart of your position to be dodged.
What's at the heart of my position is that I am gay, though I'm not sure what that says about my "lifestyle" since I'm waiting to find someone I'm committed to enough to take that step-unlike a lot of my straight friends.
What postmodern bias? You mean the scientific method? The assumption that to be a disorder something must actual cause a disordered and disrupted life? The lack of using the Bible as their primary moral authority? I follow groups like the FRC very carefully to make sure I can challenge any dishonest publishing or false fearmongering about the gay community they put out.