This avatar is what I really look like IRL. No seriously. It is. I just took it a moment ago.
But on a more serious note, I'd always wondered about a few of the pics here. I, personally, don't like looking at myself still so I try to have an avatar to reflect how I feel on the inside. I figure that an avatar reflects something about you, and can sometimes be clever, funny, or serious. I can understand why somebody would want to try to represent themselves with a cisgender woman, but I, personally, find it disingenuous, especially if you try to pass it off as yourself.