I don't tell anyone unless they ask, and then I am completely open. Being 6'3" I am closely scrutinized as a very "tall woman", and I can usually tell when people read me, but it really does not bother me anymore. I just have fun with it and go on. But of course, if I was romantically interested in someone, I would tell them before we slept together, that I have breasts and a penis. I wouldn't want to surprise them.