Is there any understandable definition of the word "fantasy"? Do you see some way to simulate it? I don''t want to create an intelligence that acts with fantasy - I think it''s impossible - this time but I want to have computer generated caracters wich seem to be able to act like.

it is virtually impossible. you would have to define "romance" as a series of events in a simulation.

You might want to refine your question. What kind of fantasy are you referring to?

1. Sexual fantasies?
2. Dragons/Knights/Castles medieval fantasy?
3. Anything else that enchants the imagination?