I don't know whether that's some genuinely physical phenomenon (aka "chemistry"), or the fact that I've come to fear the kinds of minds (read: "booby traps specifically designed to blow up in my face") that tend to come part and parcel with what might be referred to as "lifelong fantasy bodies".

Not that I have a ton of experience, here. But of what I have sampled, I discovered my arousal being significantly attenuated with lifelong fantasy bodies beginning with actual naked physical interaction. In other words, the excitement was there from the beginning of the encounter through the clothing flying every which way. But then it dropped off quickly, and needed to be supplemented by fantasizing about someone else in order to actually consummate The Deed.

That's in stark contrast to my current girlfriend, who is physically not at all what I ever fantasized about. Yet when I climax in her, I'm so utterly good to the last drop that when I'm done I have a good mind to contact the good people who make Maxwell House, and tell them, "if you only knew!"

There definitely is some disappointment in this realization, come to think of it, mostly regret for not having known all this sooner, because I wasted so damned much time imagining I needed "X", when what I really needed was "Y". And, of course, there's a whole lot more "Y" out there, making the realization all the more deity-damning.

You live and learn too late.