I have had my cockatoo, Mango, for six years. She is about 12, well raised and loved when she needed to be rehomed due to the owners health. She is wonderful,and we have had few problems.
Since she hit puberty she has been in a Constant heat. No temper, no biting, but she is begging for sex from anyone she knows. If you pet her long enough, she will vomit to prove she can feed her young. She lays eggs frequently. I did not adopt her with any intention to breed, (though she is a gorgeous umbrella, DNA, sexed, hand raised) and I do have a lifestyle that could accommodate that if I needed to. She can't be spayed. She has lots of love and interaction, showers with us. She knows shhh! And will start talking for what she wants.
I feel a huge responsibility for all my creatures Happiness. She seems for years to be needing something in a big way. I have read above about advice on how to introduce. I have read about the violence. I am putting in an avian flight area for her. Does she really want a mate? I know she thinks I would be happy to do it, but truly I am just a female human.
Before I get the lecture, I am asking so I can plan if needed, so she can be fulfilled. She did not ask to be born to humans away from her jungles. If I can get some good honest feedback, and she really would be happier with a mate, I would proceed with tons of research, advice from experts, and a carefully planned execution. I would not let her be bred, unless I knew I could provide wisely and well.
Also possible, she only wants Human babies...