I actually have a long time client who loves talking about doing exactly that--- we discuss how his gay Master would train and enslave him. In sessions I train him to be a better slave for his dream man he eventually meets and becomes property of. He also sees male escorts (on his own accord) and films it so I can give him a review of how well he sucks cock. More than a little bi curious I'd say! I do hope one day he moves on to find his dream man... Not sure you can make someone gay through Domination, I think you have to start out that way, we can just make it ok to come out of the closet.

On the otherside of the spectrum, I think straight guys fantasize about doing whats most taboo to them, it's the shock and thrill of doing something they wouldn't do themselves, never tried, or had secret thoughts about. And the thrill only increases with a Domme telling them they have to! Most never cross the line into the actual act but it's fun to prepare them with making them suck a strap on, etc