Hah.
Well, the better your imagination is and the better you can experience hallucinations (that's imposition), the better you can actually feel something like that even though it's not really happening. As for being inexperienced, think of dream sex. I'm sure majority of the people start experiencing those before they actually have any real sex themselves but it doesn't stop it from fooling them. Or making them enjoy it, I guess. Your brain has a way of filling in the blanks, of course it will most likely be wrong when you don't actually know what it is like, but hey. What works for you works for you.