Mostly genderless, however I have never remembered having a dream where I am male but have remembered a lot of dreams where I am female. Usually uh... well, sexual, (hence how I can tell I am a girl in those dreams), or 3rd person dreams (though I don't have many of those).
But then dreams are complex and it's very possible the trigger that make me remember some dreams is being a girl in them (the shock, perhaps). I don't know. Ask Freud.