Are you sure your roo isn't sick? He does look uncomfortable - maybe he's in pain?
Also if he has some reproductive problem, his hormones could be out of whack, and he could not be feeling well.
No personal experience with this, but I've heard that if you have two roos together, and one is dominant, the other can be submissive, and his hormones actually don't develop, or don't develop fully because he's around the dominant roo. Kind of like a self defense mechanism. Once you remove...