Why do some gay guys develop a lisp or voice that can easily be identified as gay?

I know I have a gay voice but honestly I can’t even tell when I talk that I sound gay. It’s only when I listen to myself on tape that I can actually here how I sound to everyone else.Why does this happen? I’ve never made a conscious effort to talk the way I do, and I assume that’s the case with most of the people on the page. So why do we develop a way of talking that differs from heterosexual guys?