beak banging

My "girl" Darla has been beak banging. Does it on my shoulder and on her perches in her cage, I've read this a male thing? Is that right? The breeder was adamant that she was female because of her genetics apparently but I'm wondering... She seems female otherwise but I had look at what I knew...

Had Rocky and Gizmo out and up on the playstand. Rocky decided it was time to make us laugh. Can anybody tell me what he is doing and why. The "pecking" is what I can't figure out.:confused: http://youtu.be/yl1OOvYaTnI