@Fa5t3r - I've got to admit I don't really like the look of fake curls on someone who has naturally straight hair. It never looks right, probably because the curls are too well kept to be natural.
I'm a big fan of just embracing the natural hair that you've got. But then, that might just be because I really don't enjoy spending hours on my own hair.
And I guess I probably don't really know if the average girl with curly hair has natural curls or not. I only notice if they look unnatural.