Ok, thanks for clarifying it my friend.
I have no good answer to this and my experience as a white man, is that few of my girlfriends have wanted to do it on me. A few have done it, but I'm not quite comfortable with it. But if we turn it around, some of my girlfriends have wanted me to tongue-fuck them in the ass, and most have been persuaded to give it a try, and just as well learned to like it ! In short, I would much rather give than receive just when it comes to tongue fucking. If you can understand what I mean ?