There is an article in the October issue of birdtalk on sexual behavior. It goes to say that Macaws in particular will pluck a brood patch. This means they will only pluck it s chest feathers. They will do this if they don't have enough nesting material. There are also many other interesting new items about sexual behavior Much of it has been done here on mytoos.
Also the fact that a female that doesn't want to copulate will fly away in the wild but in captivity will most likely be killed by the male.