I have two cockatiels that like to stay together. My female seems to want to mate but the male hasn't been interested much. They have a bond, they do groom each other, they are never far apart from each other. Recently I put a nestbox in with them. I do not wish to continuously let them breed if they do start. I have nesting material but neither one of them have taken much of an interest in the box and my male doesn't seem to want to mate while my female may be willing. Is there any thing that could help with this?