Pretty hard to sex parrots unless they're excited and 'drop the goodies.' Right now my parrot Patch is working on her egg factory again (she had so many last time they were clumped on her tube). Females have a thick tube that looks like a round straw stump. Males have the triangle wedgey thing. My parrot Kong changed gender this spring from male to female! So go figure. My other two are males, never laid eggs and sometimes I see their triangle peeking out.
As far as aggression goes my females are the worst. Glassbangers. When laying eggs they charge at me as soon as I enter the fishroom.