Do you fantasize about people whom you would never really want to sleep with? Maybe someone you know is pretty hot looking but really off-putting in person? Or maybe a celebrity who only works for you on a mental level?
For those who identify as solely gay, Can your fantasies cross genders?
I used to imagine fantasy people to jack off to when younger, but now in old age, if I jack off at all, it is usually to a picture or maybe some guys I see in the grocery store or something. Actors on TV or football and baseball players, especially when they did the ass smacking also provided jack off "grist for the mill". So I guess to anwwer your question it would have been more fantasy when younger and more fantasizing about real men when older. There are far fewer men to whom I feel attracted now than then too.
I fantasize about a lot of people, co-workers etc, that turn me on for various reasons, but if by some freak occurrence we were in an actual sexual situation, I would probably get shy and lose my nerve. But that has more to do with my own insecurities about my physical appearance then it does with my desire. I will say, however, when it comes to porn there are certain things that I find hot that I would never do in real life